Question

if the sum and the product of two numbers are 8 and 15 respectively find the sum of their cubes​

Answer 1

Answer:

8 cube is = 512

and 15 cube = 1875

sum is 2387

Answer 2

$\:\: \underline{\underline{\bf{\large\mathfrak{~~Solution~~}}}}$

according to the problem...

X+y=8

xy=15

now ... therefore....

x³+y³=(X+y)(x²+y²-xy)

now ...x²+y²=(X+y)²-2xy=8²-2(15)=34

therefore...

x³+y³=(8)(34-15)=8×19=152(answer)

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