Question

Expand the following (x+9)³

Answer 1

(a+b)^3 = a^3 + b^3 + 3ab (a+b)

a = x and b = 9

(x + 9)^3 = x^3 + 9^3 + 3 × x × 9 (x + 9)

(x + 9)^3 = x^3 + 729 + 27x (x + 9)

(x + 9)^3 = x^3 + 729 + 27x^2 + 243x

(x + 9)^3 = x^3 + 27x^2 + 243x + 729

I hope this will help you.

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