If the sum and product of two number are 7 and 45/4 respectively find the sum of their cubes
Answers
Answered by
8
If the sum and product of two numbers are 8 and 15 respectively, what is the sum of their cubes?
Still have a question? Ask your own!
What is your question?
Ad by All.me
Earning on social media has never been so real.
Join the network! Create your unique content! Earn on your popularity! Have fun!
Get the App
2 ANSWERS

Adeeba Waris, B.S. Cell Biology & Molecular Biology, Christopher Newport University (2017)
Answered Jul 26, 2018 · Author has 479answers and 64k answer views
x + y = 8
y = 8 - x
xy = 15
y = 15/x
8 - x = 15/x
x (8 - x) = 15
-x^2 + 8x = 15
-x^2 + 8x - 15 = 0
- (x^2 - 8x + 15) = 0
- (x - 3) (x - 5) = 0
x-3 = 0; x = 3
x - 5 = 0; x = 5
x + y = 8
3 + y = 8
y = 5
5 + y = 8
y = 3
x^3 + y^3
3^3 + 5^3
27 + 125
152
The x,y combination is either x = 3 and y = 5 or x = 5 and y = 3; regardless of the combination,the sum of their cubes is 154
Still have a question? Ask your own!
What is your question?
Ad by All.me
Earning on social media has never been so real.
Join the network! Create your unique content! Earn on your popularity! Have fun!
Get the App
2 ANSWERS

Adeeba Waris, B.S. Cell Biology & Molecular Biology, Christopher Newport University (2017)
Answered Jul 26, 2018 · Author has 479answers and 64k answer views
x + y = 8
y = 8 - x
xy = 15
y = 15/x
8 - x = 15/x
x (8 - x) = 15
-x^2 + 8x = 15
-x^2 + 8x - 15 = 0
- (x^2 - 8x + 15) = 0
- (x - 3) (x - 5) = 0
x-3 = 0; x = 3
x - 5 = 0; x = 5
x + y = 8
3 + y = 8
y = 5
5 + y = 8
y = 3
x^3 + y^3
3^3 + 5^3
27 + 125
152
The x,y combination is either x = 3 and y = 5 or x = 5 and y = 3; regardless of the combination,the sum of their cubes is 154
Answered by
5
Kindly refer the attachment...
Attachments:
Similar questions