# What model calculator do you use for A level Maths?

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Just wondering what calculator some of you people use for A-level Maths?

I'm using a CASIO fx-85GT PLUS but was wondering what calculators you would recommend.

Are we allowed calculators that can work out quadratic equations?

I'm using a CASIO fx-85GT PLUS but was wondering what calculators you would recommend.

Are we allowed calculators that can work out quadratic equations?

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#3

(Original post by

Just wondering what calculator some of you people use for A-level Maths?

I'm using a CASIO fx-85GT PLUS but was wondering what calculators you would recommend.

Are we allowed calculators that can work out quadratic equations?

**Philip-flop**)Just wondering what calculator some of you people use for A-level Maths?

I'm using a CASIO fx-85GT PLUS but was wondering what calculators you would recommend.

Are we allowed calculators that can work out quadratic equations?

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#4

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Thanks guys. I know you can use a calculator to work out a quadratic equation using the quadratic formula but, is there a way of using a calculator to help factorise a quadratic equation? (Sorry if I sound like such a newbie, I'm a mature student and have only been learning A-level Maths since October but before this I hadn't studied Maths since I was at school 7 years ago!!)

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#8

(Original post by

Thanks guys. I know you can use a calculator to work out a quadratic equation using the quadratic formula but, is there a way of using a calculator to help factorise a quadratic equation? (Sorry if I sound like such a newbie, I'm a mature student and have only been learning A-level Maths since October but before this I hadn't studied Maths since I was at school 7 years ago!!)

**Philip-flop**)Thanks guys. I know you can use a calculator to work out a quadratic equation using the quadratic formula but, is there a way of using a calculator to help factorise a quadratic equation? (Sorry if I sound like such a newbie, I'm a mature student and have only been learning A-level Maths since October but before this I hadn't studied Maths since I was at school 7 years ago!!)

Let's say you get x = -1, x = 5/3

All you have to do is rearrange to get 0 on one side, for each one

First one would be easy

(x+1) = 0

Second one:

x = 5/3

3x = 5

(3x - 5) = 0

Then multiply the two together to get your factorised quadratic

(x+1)(3x-5)=0

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#9

**Philip-flop**)

Thanks guys. I know you can use a calculator to work out a quadratic equation using the quadratic formula but, is there a way of using a calculator to help factorise a quadratic equation? (Sorry if I sound like such a newbie, I'm a mature student and have only been learning A-level Maths since October but before this I hadn't studied Maths since I was at school 7 years ago!!)

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#10

**Philip-flop**)

Thanks guys. I know you can use a calculator to work out a quadratic equation using the quadratic formula but, is there a way of using a calculator to help factorise a quadratic equation? (Sorry if I sound like such a newbie, I'm a mature student and have only been learning A-level Maths since October but before this I hadn't studied Maths since I was at school 7 years ago!!)

We have , plug this into your calculator. Your calculator will show you that the roots are or . This means that the quadratic factorises as .

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#12

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#14

(Original post by

The one I wrote about does, yes.

**ravioliyears**)The one I wrote about does, yes.

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#15

**Philip-flop**)

Thanks guys.

**I know you can use a calculator to work out a quadratic equation using the quadratic formula**but, is there a way of using a calculator to help factorise a quadratic equation? (Sorry if I sound like such a newbie, I'm a mature student and have only been learning A-level Maths since October but before this I hadn't studied Maths since I was at school 7 years ago!!)

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#16

(Original post by

Do you mean quadratic formula? I think he knows that already.

**Zacken**)Do you mean quadratic formula? I think he knows that already.

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(Original post by

The one I wrote about does, yes.

**ravioliyears**)The one I wrote about does, yes.

So you're saying that the CASIO fx-991ESPLUS can factorise an equation for me?

For example:

3x^2 - 2x - 8 = 0

the calculator will give the following answer...

(3x + 4)(x - 2) = 0

or will the calculator just give the answers in terms of x...

x = - 4/3 , x = 2

I was never taught how to work out quadratics using a calculator back at school so have a huge gap in my knowledge. I just want to know how as I sometimes spend a long time trying to work them out in my head

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#18

(Original post by

Hi ravioliyears,

So you're saying that the CASIO fx-991ESPLUS can factorise an equation for me?

For example:

3x^2 - 2x - 8 = 0

the calculator will give the following answer...

(3x + 4)(x - 2) = 0

or will the calculator just give the answers in terms of x...

x = - 4/3 , x = 2

I was never taught how to work out quadratics using a calculator back at school so have a huge gap in my knowledge. I just want to know how as I sometimes spend a long time trying to work them out in my head

**Philip-flop**)Hi ravioliyears,

So you're saying that the CASIO fx-991ESPLUS can factorise an equation for me?

For example:

3x^2 - 2x - 8 = 0

the calculator will give the following answer...

(3x + 4)(x - 2) = 0

or will the calculator just give the answers in terms of x...

x = - 4/3 , x = 2

I was never taught how to work out quadratics using a calculator back at school so have a huge gap in my knowledge. I just want to know how as I sometimes spend a long time trying to work them out in my head

0

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#19

**Philip-flop**)

Hi ravioliyears,

So you're saying that the CASIO fx-991ESPLUS can factorise an equation for me?

For example:

3x^2 - 2x - 8 = 0

the calculator will give the following answer...

(3x + 4)(x - 2) = 0

or will the calculator just give the answers in terms of x...

x = - 4/3 , x = 2

I was never taught how to work out quadratics using a calculator back at school so have a huge gap in my knowledge. I just want to know how as I sometimes spend a long time trying to work them out in my head

Not factorise

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#20

I use a CASIO FX-911ES Plus but also have a TI-84 as back up. I personally work a lot faster with the CASIO, but the TI is very powerful in the right hands!

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