x^2-4x=-31

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Solution for x^2-4x=-31 equation:


Simplifying
x2 + -4x = -31

Reorder the terms:
-4x + x2 = -31

Solving
-4x + x2 = -31

Solving for variable 'x'.

Reorder the terms:
31 + -4x + x2 = -31 + 31

Combine like terms: -31 + 31 = 0
31 + -4x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-31' to each side of the equation.
31 + -4x + -31 + x2 = 0 + -31

Reorder the terms:
31 + -31 + -4x + x2 = 0 + -31

Combine like terms: 31 + -31 = 0
0 + -4x + x2 = 0 + -31
-4x + x2 = 0 + -31

Combine like terms: 0 + -31 = -31
-4x + x2 = -31

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 = -31 + 4

Reorder the terms:
4 + -4x + x2 = -31 + 4

Combine like terms: -31 + 4 = -27
4 + -4x + x2 = -27

Factor a perfect square on the left side:
(x + -2)(x + -2) = -27

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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