Question

encontre as raizes da ecuacao x2-4x-5=​

Answer 1

x2-4x-5

a = 1 b = -4 c = -5

∆ = (-4)² - 4*1*(-5)

∆ = 16 + 20

∆ = 36

x = -(-4) ± √36/2

x = 4 ± 6/2

x¹ = 4+6/2 = 5

x² = 4-6/2 = -1