Question

factorize X²-4 and X²-1 and X²-9

Answer 1

X^2-4

(X)^2-(2)^2

(X+2)(X-2)

X^2-1

(X)^2-(1)^2

(X+1)(X-1)

X^2-9

(X)^2-(3)^2

(X+3)(X-3)