Odpowiedź :
a) f(x) = (x+5)(x-2)
(x+5)(x-2) = 0
x + 5 = 0 b x - 2 = 0
x = -5 v x = 2
b) f(x) = 4x^2 - 4
4x^2 - 4 = 0
4(x^2-1) = 0
4(x-1)(x+1) = 0
x - 1 = 0 v x + 1 = 0
x = 1 v x = -1
(x+5)(x-2) = 0
x + 5 = 0 b x - 2 = 0
x = -5 v x = 2
b) f(x) = 4x^2 - 4
4x^2 - 4 = 0
4(x^2-1) = 0
4(x-1)(x+1) = 0
x - 1 = 0 v x + 1 = 0
x = 1 v x = -1