Question

Descompunerii in factori:
(3x+1) la a doua -(x+3) la a doua.

Answer 1

Explicație pas cu pas:

$\boxed{ {a}^{2} - {b}^{2} = (a - b)(a + b)}$

${(3x + 1)}^{2} - {(x + 3)}^{2} = (3x + 1 - x - 3)(3x + 1 + x + 3) = (2x - 2)(4x + 4) = 2(x - 1) \cdot 4(x + 1) = 8(x - 1)(x + 1)$

Answer 2

Răspuns:

(3x + 1)² - (x + 3)²  =

(3x + 1 + x + 3)(3x + 1 - x - 3)  =

(4x + 4)(2x - 2)  =

8(x + 1)(x - 1)

a² - b² = ( a + b)(a - b)