因式分解:(x-1)^2-4=?

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因式分解:(x-1)^2-4=?
因式分解:(x-1)^2-4=?

因式分解:(x-1)^2-4=?
(x-1)^2-4=x^2-2x+1-4
=x^2-2x-3
=(x-3)(x+1)

=x^2-2X-3

(x-1)^2-4=(x-1)^2-2^2=(x-1+2)(x-1-2)=(x+1)(x-3)

(x-1)^2-4
=(x-1+2)(x-1-2)
=(x+1)(x-3)

(x-1)²-4=(x-1+2)(x-1-2)=(x+1)(x-3)