Question

resolva: x2-10x+9=0 por favor

Answer 1

Bom dia

$\frac{-(-10)+- \sqrt{(-10)^2-4*1*9} }{2*1}= \frac{10+-8}{2}$
x1= 18/2= 9
x2= 2/2= 1

Answer 2

Resolva: x2-10x+9=0 por favor

Δ = 10² - 4.1.9 ==> 100-36 = 64

x= 10+/-8 ==> x = 10+/-8
          2.1                    2

x1= 10+8 = 9
            2

x2=  10-8 = 1
            2