Question

X2-4x=-4 Solve using quadratic formula (find x)

Answer 1

Answer:

x=2

Step-by-step explanation:

$x^2-4x=-4$

$x^2-4x+4=-4+4$ (Add 4 to both sides)

$x^2-4x+4=0$

Now, we can solve it using quadratic formula

$x_{1,\:2}=\cfrac{-\left(-4\right)\pm \sqrt{\left(-4\right)^2-4* \:1* \:4}}{2* \:1}$

$x_{1,\:2}=\cfrac{-\left(-4\right)\pm \sqrt{0}}{2* \:1}$

$x=\cfrac{-\left(-4\right)}{2* \:1}$

$x=2$

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Answer 2

Add 4 to both sides of the equation.
x^2+4x+ 4 =0

4±√4^2−4⋅(1⋅4)
————————
2⋅1

x= -2