-4x^2=-x+15

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Solution for -4x^2=-x+15 equation:


Simplifying
-4x2 = -1x + 15

Reorder the terms:
-4x2 = 15 + -1x

Solving
-4x2 = 15 + -1x

Solving for variable 'x'.

Reorder the terms:
-15 + x + -4x2 = 15 + -1x + -15 + x

Reorder the terms:
-15 + x + -4x2 = 15 + -15 + -1x + x

Combine like terms: 15 + -15 = 0
-15 + x + -4x2 = 0 + -1x + x
-15 + x + -4x2 = -1x + x

Combine like terms: -1x + x = 0
-15 + x + -4x2 = 0

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

Divide each side by '-4'.
3.75 + -0.25x + x2 = 0

Move the constant term to the right:

Add '-3.75' to each side of the equation.
3.75 + -0.25x + -3.75 + x2 = 0 + -3.75

Reorder the terms:
3.75 + -3.75 + -0.25x + x2 = 0 + -3.75

Combine like terms: 3.75 + -3.75 = 0.00
0.00 + -0.25x + x2 = 0 + -3.75
-0.25x + x2 = 0 + -3.75

Combine like terms: 0 + -3.75 = -3.75
-0.25x + x2 = -3.75

The x term is x.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
-0.25x + 0.25 + x2 = -3.75 + 0.25

Reorder the terms:
0.25 + -0.25x + x2 = -3.75 + 0.25

Combine like terms: -3.75 + 0.25 = -3.5
0.25 + -0.25x + x2 = -3.5

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = -3.5

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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