Question

Alguém pode me ajudar achar o a, b e c ??? Urgenteeee!!!

Answer 1

a)

(x + 2)*(x + 3) = 6

x² + 5x + 6 = 6

x² + 5x = 0

x*(x + 5) = 0

x1 = 0, x2 = -5

b)

(2x - 3)² = 8x

4x² - 12x + 9 = 8x

4x² - 20x + 9 = 0

Δ = 400 - 4*4*9 = 256

x1 = (20 + 16)/8 = 36/8 = 9/2

x2 = (20 - 16)/8 = 4/8 = 1/2

c)

9/x - x/3 = 2

9 - x²/3 = 2x

27 - x² = 6x

x² + 6x - 27 = 0

Δ = 36 + 4*27 = 16*9

x1 = (-6 + 12)/2 = 3

x2 = (-6 - 12)/2 = -9