Question

x elevado a 2 -12x+20=0

Answer 1

x² - 12x + 20 = 0
a = 1, b = -12, c = 20
Δ = b² - 4 · a · c
Δ = (-12)² - 4 · 1 · 20
Δ = 144 - 80
Δ = 64

x' = -b + √Δ / 2a
x' = 12 + √64 / 2 · 1
x' = 12 + 8 / 2
x' = 20 / 2
x' = 10

x" = 12 - 8 / 2
x" = 4 / 2
x" = 2