Question

Descompuneți:
$(3x - 2)^2 - 100$

Answer 1

= (3x - 2)²  - 10² = 
  ( 3x - 2 + 10 ) ( 3x - 2 - 10) = 
   (3x +8) (3x - 12) 


a² - b² = (a - b )( a + b) 

Answer 2

conf formulei de calcul prescurtat a^2-b^2=(a-b)(a+b)
a=3x-2
b=10
(3x-2)^2-10^2=(3x-2-10)(3x-2+10)=(3x-12)(3x+8)=3(x-4)(3x+8)