Question

Find the value of x^3+y^3+15xy-125, When x=y=5.

Answer 1

Answer is 500
.....hope it helps

Answer 2

$= {x}^{3} + {y}^{3} + 15xy - 125$

$= {5}^{3} + {5}^{3} + (15 \times 5 \times 5) - 125$

$= 125 + 125 + (15 \times 25) - 125$

One of the the positive 125 gets cancelled by -125.

$= 125 + 375$

$= 500$








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