Question

find the value of x^3 +y^3+15xy-125if x+y=5​

Answer 1

Ans:- Given x + y = 5

Now,

=> (x + y)³ = x³ + y³ + 3×(x)×(y){x + y}

=> (5)³ = x³ + y³ + 3xy×5

=> 125 = x³ + y³ + 15xy

therefore , x³ + y³ + 15xy = 125

Now,

= x³ + y³ + 15xy - 125

= 125 - 125

= 0.

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