2. Polynomials
medium

निम्नलिखित के मान ज्ञात कीजिए

$x^{3}+y^{3}-12 x y+64,$ जब $x+y=-4$ है।

A

$1$

B

$0$

C

$-1$

D

$4$

Solution

$x^{3}+y^{3}-12 x y+64=x^{3}+y^{3}+4^{3}-3 x \times y \times 4$

$=(x+y+4)\left(x^{2}+y^{2}+4^{2}-x y-4 y-4 x\right)$ $[\because x+y=-4]$

$=(0)\left(x^{2}+y^{2}+4^{2}-x y-4 y-4 x\right)=0$

Standard 9
Mathematics

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