Question

x² -4x+4=9
mim ajdem

Answer 1

x² - 4x + 4 - 9 = 0
x² - 4x - 5 = 0
delta = 16 + 20 = 36 ou V36 = +-6 ****
x= ( 4 +-6)/2
x1 = 10/2 = 5***
x2 = -2/2 = - 1 ****

Answer 2

x²-4x +4-9=0
x²-4x-5=0
a-1    b-(-4)    c-(-5)
Δ=(-4)²-4.1.(-5)
Δ=16-(-20)
Δ=36

x=4+-√36
      2
x=4+-6
      2

x1=4+6=10=5
        2     2
x2=4-6=-2=-1
        2    2