Answer:
x=2
Step-by-step explanation:
[tex]x^2-4x=-4[/tex]
[tex]x^2-4x+4=-4+4[/tex] (Add 4 to both sides)
[tex]x^2-4x+4=0[/tex]
Now, we can solve it using quadratic formula
[tex]x_{1,\:2}=\cfrac{-\left(-4\right)\pm \sqrt{\left(-4\right)^2-4* \:1* \:4}}{2* \:1}[/tex]
[tex]x_{1,\:2}=\cfrac{-\left(-4\right)\pm \sqrt{0}}{2* \:1}[/tex]
[tex]x=\cfrac{-\left(-4\right)}{2* \:1}[/tex]
[tex]x=2[/tex]
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