# I need help with a level maths!!

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Right so I have a question that don’t understand

So we have to put this equation into the quadratic formula I hope someone can help me quick

M=2.5x(15-x)

2

That’s to divide by two after!!

So we have to put this equation into the quadratic formula I hope someone can help me quick

M=2.5x(15-x)

2

That’s to divide by two after!!

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#2

(Original post by

Right so I have a question that don’t understand

So we have to put this equation into the quadratic formula I hope someone can help me quick

M=2.5x(15-x)

2

That’s to divide by two after!!

**IonaNa**)Right so I have a question that don’t understand

So we have to put this equation into the quadratic formula I hope someone can help me quick

M=2.5x(15-x)

2

That’s to divide by two after!!

Start by multiplying both sides by 2.

What do you get?

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#4

(Original post by

Okay you’ll get 5x(30-2x)? Is that’s right

**IonaNa**)Okay you’ll get 5x(30-2x)? Is that’s right

Where has M gone?

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#5

(Original post by

Okay you’ll get 5x(30-2x)? Is that’s right

**IonaNa**)Okay you’ll get 5x(30-2x)? Is that’s right

What do you get if you multiply by 2?

You don't get 34/4.

34/4 = 17/2.

Have another try and don't forget to include both sides of the equation.

Think of 2 as 2/1 if you find that it helps.

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and so M x 2 is 2M?

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So I’d i times everything from the equation by 2 it’ll be

2M = 5x(30 - 2x)

4

2M = 5x(30 - 2x)

4

(Original post by

It isn't.

What do you get if you multiply by 2?

You don't get 34/4.

34/4 = 17/2.

Have another try and don't forget to include both sides of the equation.

Think of 2 as 2/1 if you find that it helps.

**BuryMathsTutor**)It isn't.

What do you get if you multiply by 2?

You don't get 34/4.

34/4 = 17/2.

Have another try and don't forget to include both sides of the equation.

Think of 2 as 2/1 if you find that it helps.

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(Original post by

Okay so to times all parts of the equation by 2 would be 2M=5x(30-2x)4?

**IonaNa**)Okay so to times all parts of the equation by 2 would be 2M=5x(30-2x)4?

and If you did M x 2= 2M

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**BuryMathsTutor**)

It isn't.

What do you get if you multiply by 2?

You don't get 34/4.

34/4 = 17/2.

Have another try and don't forget to include both sides of the equation.

Think of 2 as 2/1 if you find that it helps.

2M=5x(30-2x)

4

??

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#11

(Original post by

Okay so to times all parts of the equation by 2 would be

2M=5x(30-2x)

4

??

**IonaNa**)Okay so to times all parts of the equation by 2 would be

2M=5x(30-2x)

4

??

The purpose of this is to cancel out the 2 in the denominator of the right hand side of the equation.

What would the next line be?

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#12

(Original post by

How do you type equations like that?

**Soul Wavel3ngth**)How do you type equations like that?

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(Original post by

Perhaps think of it as multiplying both sides by 2/1.

The purpose of this is to cancel out the 2 in the denominator of the right hand side of the equation.

What would the next line be?

**BuryMathsTutor**)Perhaps think of it as multiplying both sides by 2/1.

The purpose of this is to cancel out the 2 in the denominator of the right hand side of the equation.

What would the next line be?

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**BuryMathsTutor**)

Perhaps think of it as multiplying both sides by 2/1.

The purpose of this is to cancel out the 2 in the denominator of the right hand side of the equation.

What would the next line be?

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#15

(Original post by

Is this better, sorry I’m being so difficult I just really need to understand this..

**IonaNa**)Is this better, sorry I’m being so difficult I just really need to understand this..

It's not quite right.

Multiplying both sides by 2 will give you

You can multiply by 2 again if you like.

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#16

**IonaNa**)

Is this better, sorry I’m being so difficult I just really need to understand this..

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(Original post by

You're not being difficult at all.

It's not quite right.

Multiplying both sides by 2 will give you

You can multiply by 2 again if you like.

**BuryMathsTutor**)You're not being difficult at all.

It's not quite right.

Multiplying both sides by 2 will give you

You can multiply by 2 again if you like.

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(Original post by

On the right hand side the '2' on the numerator 'cancels' the '2' on the denominator so you should just have 2.5x(15 - x)

**Muttley79**)On the right hand side the '2' on the numerator 'cancels' the '2' on the denominator so you should just have 2.5x(15 - x)

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#19

(Original post by

Oh I get unit now.. what’s the next step?

**IonaNa**)Oh I get unit now.. what’s the next step?

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(Original post by

If you prefer to be working with integers you could now multiply both sides by 2 again. After that, bring all your terms to one side so that you have something of the form

**BuryMathsTutor**)If you prefer to be working with integers you could now multiply both sides by 2 again. After that, bring all your terms to one side so that you have something of the form

2.5x^2 - 37.5x - 2M= 0??

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