-x^2+8x=25

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Solution for -x^2+8x=25 equation:


Simplifying
-1x2 + 8x = 25

Reorder the terms:
8x + -1x2 = 25

Solving
8x + -1x2 = 25

Solving for variable 'x'.

Reorder the terms:
-25 + 8x + -1x2 = 25 + -25

Combine like terms: 25 + -25 = 0
-25 + 8x + -1x2 = 0

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

Divide each side by '-1'.
25 + -8x + x2 = 0

Move the constant term to the right:

Add '-25' to each side of the equation.
25 + -8x + -25 + x2 = 0 + -25

Reorder the terms:
25 + -25 + -8x + x2 = 0 + -25

Combine like terms: 25 + -25 = 0
0 + -8x + x2 = 0 + -25
-8x + x2 = 0 + -25

Combine like terms: 0 + -25 = -25
-8x + x2 = -25

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 = -25 + 16

Reorder the terms:
16 + -8x + x2 = -25 + 16

Combine like terms: -25 + 16 = -9
16 + -8x + x2 = -9

Factor a perfect square on the left side:
(x + -4)(x + -4) = -9

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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