Question

Subtract the following :-

(a) x
3+y3
-3xy from -3x3+7xy​

Answer 1

Answer:

x+y=7

Cubing both sides, we get

(x+y)

3

=7

3

or x

3

+y

3

+3xy(x+y)=343

or x

3

+y

3

+3×0×7=343

or x

3

+y

3

=343

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Answer 2

Answer:

(-3x³+7xy)-(x³+y³-3xy)

=-3x³+7xy-x³-y³+3xy

=-3x³-x³+7xy+3xy-y³

=-4x³+10xy-y³