Quadratic Equations - Problem solving Watch

musicangel
Badges: 10
Rep:
?
#1
Report Thread starter 4 years ago
#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
Attached files
0
reply
TeeEm
Badges: 19
Rep:
?
#2
Report 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
reply
TeeEm
Badges: 19
Rep:
?
#3
Report 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
reply
musicangel
Badges: 10
Rep:
?
#4
Report Thread starter 4 years ago
#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
reply
danconway
Badges: 11
Rep:
?
#5
Report 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
reply
TeeEm
Badges: 19
Rep:
?
#6
Report 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).
danconway answered the question ...
0
reply
musicangel
Badges: 10
Rep:
?
#7
Report Thread starter 4 years ago
#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
reply
musicangel
Badges: 10
Rep:
?
#8
Report Thread starter 4 years ago
#8
Does anyone know the method for question 9?
0
reply
danconway
Badges: 11
Rep:
?
#9
Report 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
reply
TenOfThem
Badges: 16
Rep:
?
#10
Report 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
reply
musicangel
Badges: 10
Rep:
?
#11
Report Thread starter 4 years ago
#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
reply
danconway
Badges: 11
Rep:
?
#12
Report 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
reply
musicangel
Badges: 10
Rep:
?
#13
Report Thread starter 4 years ago
#13
(Original post by danconway)
Exactly!
Thank you all so much!
This has really helped me!
0
reply
Dylann
Badges: 21
Rep:
?
#14
Report 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 :rolleyes:

Posted from TSR Mobile
0
reply
TeeEm
Badges: 19
Rep:
?
#15
Report 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 :rolleyes:

Posted from TSR Mobile
0
reply
musicangel
Badges: 10
Rep:
?
#16
Report Thread starter 4 years ago
#16
I don't understand what the two questions attached mean.
Once again, I would really appreciate any help.
Thanks!
Attached files
0
reply
davros
  • Study Helper
Badges: 16
Rep:
?
#17
Report 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
reply
musicangel
Badges: 10
Rep:
?
#18
Report Thread starter 4 years ago
#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
reply
Mr M
Badges: 20
Rep:
?
#19
Report 4 years ago
#19
(Original post by danconway)
Exactly!
Eggsactly surely?
0
reply
davros
  • Study Helper
Badges: 16
Rep:
?
#20
Report 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
reply
X

Quick Reply

Attached files
Write a reply...
Reply
new posts
Back
to top
Latest
My Feed

See more of what you like on
The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

Personalise

University open days

  • Cardiff Metropolitan University
    Undergraduate Open Day - Llandaff Campus Undergraduate
    Sat, 19 Oct '19
  • Coventry University
    Undergraduate Open Day Undergraduate
    Sat, 19 Oct '19
  • University of Birmingham
    Undergraduate Open Day Undergraduate
    Sat, 19 Oct '19

Why wouldn't you turn to teachers if you were being bullied?

They might tell my parents (11)
6.01%
They might tell the bully (18)
9.84%
I don't think they'd understand (32)
17.49%
It might lead to more bullying (70)
38.25%
There's nothing they could do (52)
28.42%

Watched Threads

View All