Question

resolva as equaçoeas do 2º grau x²+9=4x

Answer 1

x² + 9 = 4x
x² - 4x + 9 = 0
Δ = (-4)² - 4 * 1 * 9
Δ = 16 - 36
Δ = - 20
x = - (-4) +- √-20 / 2a
x1 = 4 + 2√5i / 2
x2 = 4 - 2√5i / 2