Question

(x-3) (x+3)=2(x+1)²-(x-1)²=

Prosze o obliczenia

Answer 1

(x-3) (x+3)=2(x+1)²-(x-1)²

x² - 9 = 2(x² + 2x  +1) - x² + 2x - 1

x² - 9 = 2x² + 4x + 2 - x² + 2x - 1

x² - 9 = x² + 6x + 1

-9 - 1 = 6x

6x = -10

x = -10/6

x = -5/3

x = -1 i 2/3