a) (x + 2)² - (y + 1)²
b) (x + 7)² - 5(x + 7) = (x + 7) * [(x + 7)- 5] = (x + 7) * (x + 2)
c) (x - 5)² - 3(x - 5) = (x - 5) * (x - 5 - 3) = (x - 5)(x - 2)
d) (x + 2)(2x - 1)² - 4(x + 2) = (x + 2)(4x² - 4x + 1 - 4) = (x + 2)(4x²-4x - 3)
nu stiu care este cerinta, dar sper ca asta trebuia
