Question

Factorise the polynomial: ( x+1)^3 + ( x-1)^3​

Answer 1

(x+1)^3=x^3+1+3x^2+3x

(x-1)^3=x^3-1-3x^2+3x

(x+1)^3+(x-1)^3=x^3+1+3x^2+3x+x^3-1-3x^2+3x=2x^3+6x

So, correct answer is 2x^3+6x

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