Question

if sum and product of two nos. are 8 and 15 respectively. Find the sum of their cubes


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Answer 1

Answer:

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

Step-by-step explanation:

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Answer 2

This is the answer

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