Question

verify x³+y³ =(x+y) (x2-xy+y²​

Answer 1

Answer:

Step-by-step explanation:

RHS = (x+y) (x²-xy+y²)

=x(x²-xy+y²)+y(x²-xy+y²)

= x³-x²y+xy²+x²y-xy²+y³

after cancelling,

=x³+y3

=LHS

1) if x= 1, y=2

LHS = 1³+2³=1+8 =9  ---(1)

RHS = (x+y)(x²-xy+y²)

=(1+2)(1²-1*2+2²)

=3*(1-2+4)

=3*3

=9  ---(2)

LHS = RHS

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