Question

Descompune, folosind formula a^2-b^2=(a-b)(a+b):a) x^2-y^2b)x^2-4 c) x^2-16 d) y^2-1​

Answer 1

$a) x^2-y^2=(x-y)(x+y)\\b)x^2-4=x^2-2^2=(x-2)(x+2)\\c) x^2-16 =x^2-4^2=(x-4)(x+4)\\d) y^2-1=y^2-1^2=(y-1)(y+1)$