-x^2+8x=23

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Solution for -x^2+8x=23 equation:


Simplifying
-1x2 + 8x = 23

Reorder the terms:
8x + -1x2 = 23

Solving
8x + -1x2 = 23

Solving for variable 'x'.

Reorder the terms:
-23 + 8x + -1x2 = 23 + -23

Combine like terms: 23 + -23 = 0
-23 + 8x + -1x2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
23 + -8x + x2 = 0

Move the constant term to the right:

Add '-23' to each side of the equation.
23 + -8x + -23 + x2 = 0 + -23

Reorder the terms:
23 + -23 + -8x + x2 = 0 + -23

Combine like terms: 23 + -23 = 0
0 + -8x + x2 = 0 + -23
-8x + x2 = 0 + -23

Combine like terms: 0 + -23 = -23
-8x + x2 = -23

The x term is -8x.  Take half its coefficient (-4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
-8x + 16 + x2 = -23 + 16

Reorder the terms:
16 + -8x + x2 = -23 + 16

Combine like terms: -23 + 16 = -7
16 + -8x + x2 = -7

Factor a perfect square on the left side:
(x + -4)(x + -4) = -7

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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