Question

we have to prove these identities.
chapter- polynomials
question 9 exercise 2.5 ncert math book​

Answer 1

i hope it will help you

and i think so it is right answer

Answer 2

Step-by-step explanation:

x³+y³=(x+y)(x²-xy+y²)

(x+y) ³=x³+y³-3xy(x+y)

x³+y³=(x+y) {(x+y) ²-3xy}

=(x+y) {(x²+2xy+y²)-3xy}

=(x+y)(x²-xy+y²)

x³-y³=(x-y) (x²+xy+y²)

(x-y) ³=x³-y³+3xy(x-y)

x³-y³=(x-y) {(x-y)²+3xy}

=(x-y) {(x²-2xy+y²)+3xy}

=(x-y) (x²+xy+y²)