Question

Descompuneti in factori folosind formula: a²-b²=(a-b)(a+b):
a). x²-1
b). x²-4
c). x²-9
d). x²-16
e). x²-25

Answer 1

$a) x^1-1 \to (x-1)(x+1) \\\\ b)x^2-4 \to (x-2)(x+2) \\\\ c) x^2-9\to (x-3)(x+3) \\\\ d) x^2-16 \to (x-4)(x+4) \\\\ e) x^2-25 \to (x+5)(x-5)$

Answer 2

a)(x-1)(x+1)
b)(x-2)(x+2)
c)(x-3)(x+3)
d)(x-4)(x+4)
e)(x-5)(x+5)