Question

Resolva a equanção  do 2 grau a) x2-2x-120=0 , b) x2+8x-33=0

Answer 1

a) x² - 2x - 120 = 0

Δ = (-2)² - 4.1.(-120)
Δ = 4 + 480
Δ = 484

x' = $\frac{2 + 22}{2} = \frac{24}{2} = 12$
x'' = $\frac{2 - 22}{2} = \frac{-20}{2} = - 10$

b) x² + 8x - 33
Δ = 8² - 4.1.(-33)
Δ = 64 + 132
Δ = 196

x' = $\frac{-8 + 14}{2} = \frac{6}{2} = 3$
x'' = $\frac{-8 - 14}{2} = \frac{-22}{2} = -11$