Question

determinar as raízes do polinômio p(x)=x2-2x-15

Answer 1

y = x² - 2x - 15

x² - 2x - 15 = 0

Δ = b² - 4.a.c
Δ = (-2)² - 4.1.(-15)
Δ = 4 + 60
Δ = 64

x = -b +/- √Δ/2a
x = 2 +/- 8/2
x' = 5
x'' = -3