Question

Descompuneti in factori, folosind formulele de calcul prescurtat:

(a + 1)² - 4

9 - (2b + 3)²

16c² - (3c + 5d)²

Answer 1

(a+1)^2-4=(a+1-2)(a+1+2)=(a-1)(a+3)
9-(2b+3)^2=(3+2b+3)(3-2b-3)=(6+2b)(-2b)
16c^2-(3c+5d)^2=(4c+3c+5d)(4c-3c-5d)=(9c+5d)(c-5d)