4x^2-20x=-31

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Solution for 4x^2-20x=-31 equation:


Simplifying
4x2 + -20x = -31

Reorder the terms:
-20x + 4x2 = -31

Solving
-20x + 4x2 = -31

Solving for variable 'x'.

Reorder the terms:
31 + -20x + 4x2 = -31 + 31

Combine like terms: -31 + 31 = 0
31 + -20x + 4x2 = 0

Begin completing the square.  Divide all terms by
4 the coefficient of the squared term: 

Divide each side by '4'.
7.75 + -5x + x2 = 0

Move the constant term to the right:

Add '-7.75' to each side of the equation.
7.75 + -5x + -7.75 + x2 = 0 + -7.75

Reorder the terms:
7.75 + -7.75 + -5x + x2 = 0 + -7.75

Combine like terms: 7.75 + -7.75 = 0.00
0.00 + -5x + x2 = 0 + -7.75
-5x + x2 = 0 + -7.75

Combine like terms: 0 + -7.75 = -7.75
-5x + x2 = -7.75

The x term is -5x.  Take half its coefficient (-2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
-5x + 6.25 + x2 = -7.75 + 6.25

Reorder the terms:
6.25 + -5x + x2 = -7.75 + 6.25

Combine like terms: -7.75 + 6.25 = -1.5
6.25 + -5x + x2 = -1.5

Factor a perfect square on the left side:
(x + -2.5)(x + -2.5) = -1.5

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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