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Identity (x+y)^2

If x+y=1 th...

Question

If $x + y = 1$ then $x^{3} + y^{3} + 3 x y = . . . . . . . . . . . .$

A

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B

1

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C

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D

None of these

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Solution

The correct option is B $1$
$x + y = 1$ & $x^{3} + y^{3} + 3 x y = (x + y)^{3} - 3 x y (x + y) + 3 x y = 1$

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