Question

Descompuneri în factori dau coroana!!

a)x²-y²
b) 4-a²
c)25x²-9y²
d)x²-9
e)9y²-16z²
f)a²b²-49

Answer 1

a)(x-y)(x+y)
b)(2-a)(2+a)
c)(5x-3y)(5x+3y)
d)(x-3)(x+3)
e)(3y-4z)(3y+4z)
f)(ab-7)(ab+7)

Answer 2

Ne vom folosi de formula (a+b)(a-b)=a²-b²
a) x²-y²=(x+y)(x-y)
b)4-a²=(2+a)(2-a)
c)25x²-9y²=(5x+3y)(5x-3y)
d) x²-9=(x+3)(x-3)
e) 9y²-16z²=(3y-4z)(3y+4z)
f)a²b²-49=(ab+7)(ab-7)