-x^2+25x-40=0

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Solution for -x^2+25x-40=0 equation:


Simplifying
-1x2 + 25x + -40 = 0

Reorder the terms:
-40 + 25x + -1x2 = 0

Solving
-40 + 25x + -1x2 = 0

Solving for variable 'x'.

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

Divide each side by '-1'.
40 + -25x + x2 = 0

Move the constant term to the right:

Add '-40' to each side of the equation.
40 + -25x + -40 + x2 = 0 + -40

Reorder the terms:
40 + -40 + -25x + x2 = 0 + -40

Combine like terms: 40 + -40 = 0
0 + -25x + x2 = 0 + -40
-25x + x2 = 0 + -40

Combine like terms: 0 + -40 = -40
-25x + x2 = -40

The x term is -25x.  Take half its coefficient (-12.5).
Square it (156.25) and add it to both sides.

Add '156.25' to each side of the equation.
-25x + 156.25 + x2 = -40 + 156.25

Reorder the terms:
156.25 + -25x + x2 = -40 + 156.25

Combine like terms: -40 + 156.25 = 116.25
156.25 + -25x + x2 = 116.25

Factor a perfect square on the left side:
(x + -12.5)(x + -12.5) = 116.25

Calculate the square root of the right side: 10.781929326

Break this problem into two subproblems by setting 
(x + -12.5) equal to 10.781929326 and -10.781929326.

Subproblem 1

x + -12.5 = 10.781929326 Simplifying x + -12.5 = 10.781929326 Reorder the terms: -12.5 + x = 10.781929326 Solving -12.5 + x = 10.781929326 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '12.5' to each side of the equation. -12.5 + 12.5 + x = 10.781929326 + 12.5 Combine like terms: -12.5 + 12.5 = 0.0 0.0 + x = 10.781929326 + 12.5 x = 10.781929326 + 12.5 Combine like terms: 10.781929326 + 12.5 = 23.281929326 x = 23.281929326 Simplifying x = 23.281929326

Subproblem 2

x + -12.5 = -10.781929326 Simplifying x + -12.5 = -10.781929326 Reorder the terms: -12.5 + x = -10.781929326 Solving -12.5 + x = -10.781929326 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '12.5' to each side of the equation. -12.5 + 12.5 + x = -10.781929326 + 12.5 Combine like terms: -12.5 + 12.5 = 0.0 0.0 + x = -10.781929326 + 12.5 x = -10.781929326 + 12.5 Combine like terms: -10.781929326 + 12.5 = 1.718070674 x = 1.718070674 Simplifying x = 1.718070674

Solution

The solution to the problem is based on the solutions from the subproblems. x = {23.281929326, 1.718070674}

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