# Quadratic Equations - Problem solving Watch

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Hi,

I have to use quadratic equations to solve the two attached questions but I do not know how to for any of them.

The answer for 8 is 12 eggs and the answer for 9 is 13 eggs.

I would really appreciate any help!

Thanks

I have to use quadratic equations to solve the two attached questions but I do not know how to for any of them.

The answer for 8 is 12 eggs and the answer for 9 is 13 eggs.

I would really appreciate any help!

Thanks

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#2

(Original post by

Hi,

I have to use quadratic equations to solve the two attached questions but I do not know how to for any of them.

The answer for 8 is 12 eggs and the answer for 9 is 13 eggs.

I would really appreciate any help!

Thanks

**musicangel**)Hi,

I have to use quadratic equations to solve the two attached questions but I do not know how to for any of them.

The answer for 8 is 12 eggs and the answer for 9 is 13 eggs.

I would really appreciate any help!

Thanks

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#3

**musicangel**)

Hi,

I have to use quadratic equations to solve the two attached questions but I do not know how to for any of them.

The answer for 8 is 12 eggs and the answer for 9 is 13 eggs.

I would really appreciate any help!

Thanks

so many people around and we are all too lazy to help.

Here it comes the first one

x(x+5) = 84

can you see why?

do you know how to solve it?

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(Original post by

shameful ...

so many people around and we are all too lazy to help.

Here it comes the first one

x(x+5) = 84

can you see why?

do you know how to solve it?

**TeeEm**)shameful ...

so many people around and we are all too lazy to help.

Here it comes the first one

x(x+5) = 84

can you see why?

do you know how to solve it?

Thank you so much for this!

I managed to solve it but I do not know why you multiply x and (x+5).

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#5

(Original post by

Thank you so much for this!

I managed to solve it but I do not know why you multiply x and (x+5).

**musicangel**)Thank you so much for this!

I managed to solve it but I do not know why you multiply x and (x+5).

So you have

*x profit (per egg)*times

*the number of eggs*, which is (

*x*+5).

Like (in a different scenario) if you make a profit £2 per chocolate and you sell 5 chocolates, you'd do 5 x £2 and you'd make £10 in total.

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#6

**musicangel**)

Thank you so much for this!

I managed to solve it but I do not know why you multiply x and (x+5).

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(Original post by

x is the profit and (x+5) is the number of eggs.

So you have

Like (in a different scenario) if you make a profit £2 per chocolate and you sell 5 chocolates, you'd do 5 x £2 and you'd make £10 in total.

**danconway**)x is the profit and (x+5) is the number of eggs.

So you have

*x profit (per egg)*times*the number of eggs*, which is (*x*+5).Like (in a different scenario) if you make a profit £2 per chocolate and you sell 5 chocolates, you'd do 5 x £2 and you'd make £10 in total.

Thank you so much! This makes sense now!

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#9

(Original post by

Does anyone know the method for question 9?

**musicangel**)Does anyone know the method for question 9?

**times**the price per thing. In this scenario, there are two products to consider.

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#10

(Original post by

Does anyone know the method for question 9?

**musicangel**)Does anyone know the method for question 9?

It is the same as the method for q8

Did you actually understand the method for q8

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(Original post by

Do you fancy coming up with an equation for the situation? Remember the total price of something is the number of things

**danconway**)Do you fancy coming up with an equation for the situation? Remember the total price of something is the number of things

**times**the price per thing. In this scenario, there are two products to consider.Would it be

x(x-8)+(x-2)(x-3)-175=0

x^2-8x + x^2-5x+6-175=0

2x^2 - 13x - 169 = 0

and then solving it?

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#12

(Original post by

Would it be

x(x-8)+(x-2)(x-3)-175=0

x^2-8x + x^2-5x+6-175=0

2x^2 - 13x - 169 = 0

and then solving it?

**musicangel**)Would it be

x(x-8)+(x-2)(x-3)-175=0

x^2-8x + x^2-5x+6-175=0

2x^2 - 13x - 169 = 0

and then solving it?

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(Original post by

Exactly!

**danconway**)Exactly!

This has really helped me!

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#14

(Original post by

eggs must be very cheap in the US

**TeeEm**)eggs must be very cheap in the US

Posted from TSR Mobile

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#15

**Dylann**)

Fun fact: US eggs aren't allowed in European supermarkets and European eggs aren't allowed in US supermarkets. The reasons why contradict each other

Posted from TSR Mobile

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I don't understand what the two questions attached mean.

Once again, I would really appreciate any help.

Thanks!

Once again, I would really appreciate any help.

Thanks!

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#17

(Original post by

I don't understand what the two questions attached mean.

Once again, I would really appreciate any help.

Thanks!

**musicangel**)I don't understand what the two questions attached mean.

Once again, I would really appreciate any help.

Thanks!

Do you know how to translate the English phrase "x exceeds y by 3" into a mathematical statement relating x and y?

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(Original post by

Do you know what the reciprocal of a number is?

Do you know how to translate the English phrase "x exceeds y by 3" into a mathematical statement relating x and y?

**davros**)Do you know what the reciprocal of a number is?

Do you know how to translate the English phrase "x exceeds y by 3" into a mathematical statement relating x and y?

I don't know what the reciprocal of a number is.

Would it be y + 3 = x or y = x - 3 depending what the subject is?

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#20

(Original post by

I don't know what the reciprocal of a number is.

Would it be y + 3 = x or y = x - 3 depending what the subject is?

**musicangel**)I don't know what the reciprocal of a number is.

Would it be y + 3 = x or y = x - 3 depending what the subject is?

Correct - if x exceeds y by 3 then x = y + 3.

Now you can set up the equation for your first new problem

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