# Quadratic Equations - Problem solvingWatch

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#1
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
0
4 years ago
#2
(Original post by 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
eggs must be very cheap in the US
1
4 years ago
#3
(Original post by 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
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?
0
#4
(Original post by 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).
0
4 years ago
#5
(Original post by musicangel)
Thank you so much for this!
I managed to solve it but I do not know why you multiply x and (x+5).
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.
0
4 years ago
#6
(Original post by musicangel)
Thank you so much for this!
I managed to solve it but I do not know why you multiply x and (x+5).
0
#7
(Original post by 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!
0
#8
Does anyone know the method for question 9?
0
4 years ago
#9
(Original post by musicangel)
Does anyone know the method for question 9?
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.
0
4 years ago
#10
(Original post by musicangel)
Does anyone know the method for question 9?
Yes

It is the same as the method for q8

Did you actually understand the method for q8
0
#11
(Original post by 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?
0
4 years ago
#12
(Original post by 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?
Exactly!
0
#13
(Original post by danconway)
Exactly!
Thank you all so much!
This has really helped me!
0
4 years ago
#14
(Original post by TeeEm)
eggs must be very cheap in the US
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
0
4 years ago
#15
(Original post by 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
0
#16
I don't understand what the two questions attached mean.
Once again, I would really appreciate any help.
Thanks!
0
4 years ago
#17
(Original post by musicangel)
I don't understand what the two questions attached mean.
Once again, I would really appreciate any help.
Thanks!
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?
1
#18
(Original post by 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?
0
4 years ago
#19
(Original post by danconway)
Exactly!
Eggsactly surely?
0
4 years ago
#20
(Original post by 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?
The reciprocal of a number is 1 divided by that number, so the reciprocal of 3 is 1/3 and the reciprocal of x is 1/x.

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

Now you can set up the equation for your first new problem
0
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