Question

Putin ajutor va rog c:

Answer 1

(x-3)² + (x-5)(x+3) = 2 (x-1)(x+1) -20

(x-3)²  = x² - 6x + 9
(x-5)(x+3) = x² +3x - 5x -15 = x² -2x-15
(x-1)(x+1) = x²-1

adica
x² - 6x + 9 +x² -2x-15 = 2(x²-1) -20
2x² - 8x - 6 = 2x² - 2 - 20
trecem totul intr-o singura parte:
2x² - 8x -6 - 2x² +22 =0
-8x + 16 =0
16 = 8x
x = 2