13. Rozwiąż równania.
a) (x+3)(x + 2) - x2 = 0
b) (x - 4)(x + 5) - x2 = 3
d) 2x2 - (2x + 1)(x - 2) = 5
e) x2 - 2 = (x + 2)(x+4)
f) (x - 3)(4x + 2) = 4x2 + 3
c) x2 - (x - 3)(x - 1) = 1​