-x^2+19x+26=0

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Solution for -x^2+19x+26=0 equation:


Simplifying
-1x2 + 19x + 26 = 0

Reorder the terms:
26 + 19x + -1x2 = 0

Solving
26 + 19x + -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'.
-26 + -19x + x2 = 0

Move the constant term to the right:

Add '26' to each side of the equation.
-26 + -19x + 26 + x2 = 0 + 26

Reorder the terms:
-26 + 26 + -19x + x2 = 0 + 26

Combine like terms: -26 + 26 = 0
0 + -19x + x2 = 0 + 26
-19x + x2 = 0 + 26

Combine like terms: 0 + 26 = 26
-19x + x2 = 26

The x term is -19x.  Take half its coefficient (-9.5).
Square it (90.25) and add it to both sides.

Add '90.25' to each side of the equation.
-19x + 90.25 + x2 = 26 + 90.25

Reorder the terms:
90.25 + -19x + x2 = 26 + 90.25

Combine like terms: 26 + 90.25 = 116.25
90.25 + -19x + x2 = 116.25

Factor a perfect square on the left side:
(x + -9.5)(x + -9.5) = 116.25

Calculate the square root of the right side: 10.781929326

Break this problem into two subproblems by setting 
(x + -9.5) equal to 10.781929326 and -10.781929326.

Subproblem 1

x + -9.5 = 10.781929326 Simplifying x + -9.5 = 10.781929326 Reorder the terms: -9.5 + x = 10.781929326 Solving -9.5 + x = 10.781929326 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9.5' to each side of the equation. -9.5 + 9.5 + x = 10.781929326 + 9.5 Combine like terms: -9.5 + 9.5 = 0.0 0.0 + x = 10.781929326 + 9.5 x = 10.781929326 + 9.5 Combine like terms: 10.781929326 + 9.5 = 20.281929326 x = 20.281929326 Simplifying x = 20.281929326

Subproblem 2

x + -9.5 = -10.781929326 Simplifying x + -9.5 = -10.781929326 Reorder the terms: -9.5 + x = -10.781929326 Solving -9.5 + x = -10.781929326 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9.5' to each side of the equation. -9.5 + 9.5 + x = -10.781929326 + 9.5 Combine like terms: -9.5 + 9.5 = 0.0 0.0 + x = -10.781929326 + 9.5 x = -10.781929326 + 9.5 Combine like terms: -10.781929326 + 9.5 = -1.281929326 x = -1.281929326 Simplifying x = -1.281929326

Solution

The solution to the problem is based on the solutions from the subproblems. x = {20.281929326, -1.281929326}

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