2x^2-8x=-15

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Solution for 2x^2-8x=-15 equation:


Simplifying
2x2 + -8x = -15

Reorder the terms:
-8x + 2x2 = -15

Solving
-8x + 2x2 = -15

Solving for variable 'x'.

Reorder the terms:
15 + -8x + 2x2 = -15 + 15

Combine like terms: -15 + 15 = 0
15 + -8x + 2x2 = 0

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

Divide each side by '2'.
7.5 + -4x + x2 = 0

Move the constant term to the right:

Add '-7.5' to each side of the equation.
7.5 + -4x + -7.5 + x2 = 0 + -7.5

Reorder the terms:
7.5 + -7.5 + -4x + x2 = 0 + -7.5

Combine like terms: 7.5 + -7.5 = 0.0
0.0 + -4x + x2 = 0 + -7.5
-4x + x2 = 0 + -7.5

Combine like terms: 0 + -7.5 = -7.5
-4x + x2 = -7.5

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 = -7.5 + 4

Reorder the terms:
4 + -4x + x2 = -7.5 + 4

Combine like terms: -7.5 + 4 = -3.5
4 + -4x + x2 = -3.5

Factor a perfect square on the left side:
(x + -2)(x + -2) = -3.5

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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