x^2-4x=-45

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Solution for x^2-4x=-45 equation:


Simplifying
x2 + -4x = -45

Reorder the terms:
-4x + x2 = -45

Solving
-4x + x2 = -45

Solving for variable 'x'.

Reorder the terms:
45 + -4x + x2 = -45 + 45

Combine like terms: -45 + 45 = 0
45 + -4x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-45' to each side of the equation.
45 + -4x + -45 + x2 = 0 + -45

Reorder the terms:
45 + -45 + -4x + x2 = 0 + -45

Combine like terms: 45 + -45 = 0
0 + -4x + x2 = 0 + -45
-4x + x2 = 0 + -45

Combine like terms: 0 + -45 = -45
-4x + x2 = -45

The x term is -4x.  Take half its coefficient (-2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
-4x + 4 + x2 = -45 + 4

Reorder the terms:
4 + -4x + x2 = -45 + 4

Combine like terms: -45 + 4 = -41
4 + -4x + x2 = -41

Factor a perfect square on the left side:
(x + -2)(x + -2) = -41

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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