Question

x sobre 2 menos 10x - 11 = 0 ​

Answer 1

Resposta:

x²-10x-11=0

a= 1

b= -10

c= -11

∆² = b² - 4ac

∆² = (-10)² - 4.1.(-11)

∆²  = 100 + 44

∆²  = 144

∆ = 12

x'= -b+∆/2a = -(-10) + 12/2.1 = 10+12/2 = 11

x'' - b - ∆/2a= -(-10) - 12/2.1= 10-12/2 = -1