Question

If X + Y is equal to 15 then x minus 10 ka whole cube + y - 5 whole cube is

Answer 1

Step-by-step explanation:

Given:- X + Y = 15

To find :- (X -10)³ + ( Y - 5)³

solve:-

as we know that

(a+b)³ = a³+3a²b+3ab²+b³

(a-b)³ = a³-3a²b+3ab²-b³

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so

(X -10)³ = X³-3(X)²(10)+3(X)(10)²-(10)³

(X -10)³ = X³-30X²+300X-1000...

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simillarly:-

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(Y - 5)³ = Y³-3(Y)²(5)+3(Y)(5)²-(5)³

(Y - 5)³ = Y³-15(Y)²+3(Y)(25)-125

(Y - 5)³ = Y³-15(Y)²+75(Y)-125....

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