-x^2=-17x+23

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Solution for -x^2=-17x+23 equation:


Simplifying
-1x2 = -17x + 23

Reorder the terms:
-1x2 = 23 + -17x

Solving
-1x2 = 23 + -17x

Solving for variable 'x'.

Reorder the terms:
-23 + 17x + -1x2 = 23 + -17x + -23 + 17x

Reorder the terms:
-23 + 17x + -1x2 = 23 + -23 + -17x + 17x

Combine like terms: 23 + -23 = 0
-23 + 17x + -1x2 = 0 + -17x + 17x
-23 + 17x + -1x2 = -17x + 17x

Combine like terms: -17x + 17x = 0
-23 + 17x + -1x2 = 0

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

Divide each side by '-1'.
23 + -17x + x2 = 0

Move the constant term to the right:

Add '-23' to each side of the equation.
23 + -17x + -23 + x2 = 0 + -23

Reorder the terms:
23 + -23 + -17x + x2 = 0 + -23

Combine like terms: 23 + -23 = 0
0 + -17x + x2 = 0 + -23
-17x + x2 = 0 + -23

Combine like terms: 0 + -23 = -23
-17x + x2 = -23

The x term is -17x.  Take half its coefficient (-8.5).
Square it (72.25) and add it to both sides.

Add '72.25' to each side of the equation.
-17x + 72.25 + x2 = -23 + 72.25

Reorder the terms:
72.25 + -17x + x2 = -23 + 72.25

Combine like terms: -23 + 72.25 = 49.25
72.25 + -17x + x2 = 49.25

Factor a perfect square on the left side:
(x + -8.5)(x + -8.5) = 49.25

Calculate the square root of the right side: 7.017834424

Break this problem into two subproblems by setting 
(x + -8.5) equal to 7.017834424 and -7.017834424.

Subproblem 1

x + -8.5 = 7.017834424 Simplifying x + -8.5 = 7.017834424 Reorder the terms: -8.5 + x = 7.017834424 Solving -8.5 + x = 7.017834424 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '8.5' to each side of the equation. -8.5 + 8.5 + x = 7.017834424 + 8.5 Combine like terms: -8.5 + 8.5 = 0.0 0.0 + x = 7.017834424 + 8.5 x = 7.017834424 + 8.5 Combine like terms: 7.017834424 + 8.5 = 15.517834424 x = 15.517834424 Simplifying x = 15.517834424

Subproblem 2

x + -8.5 = -7.017834424 Simplifying x + -8.5 = -7.017834424 Reorder the terms: -8.5 + x = -7.017834424 Solving -8.5 + x = -7.017834424 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '8.5' to each side of the equation. -8.5 + 8.5 + x = -7.017834424 + 8.5 Combine like terms: -8.5 + 8.5 = 0.0 0.0 + x = -7.017834424 + 8.5 x = -7.017834424 + 8.5 Combine like terms: -7.017834424 + 8.5 = 1.482165576 x = 1.482165576 Simplifying x = 1.482165576

Solution

The solution to the problem is based on the solutions from the subproblems. x = {15.517834424, 1.482165576}

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