x^2-19x=28

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Solution for x^2-19x=28 equation:


Simplifying
x2 + -19x = 28

Reorder the terms:
-19x + x2 = 28

Solving
-19x + x2 = 28

Solving for variable 'x'.

Reorder the terms:
-28 + -19x + x2 = 28 + -28

Combine like terms: 28 + -28 = 0
-28 + -19x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '28' to each side of the equation.
-28 + -19x + 28 + x2 = 0 + 28

Reorder the terms:
-28 + 28 + -19x + x2 = 0 + 28

Combine like terms: -28 + 28 = 0
0 + -19x + x2 = 0 + 28
-19x + x2 = 0 + 28

Combine like terms: 0 + 28 = 28
-19x + x2 = 28

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 = 28 + 90.25

Reorder the terms:
90.25 + -19x + x2 = 28 + 90.25

Combine like terms: 28 + 90.25 = 118.25
90.25 + -19x + x2 = 118.25

Factor a perfect square on the left side:
(x + -9.5)(x + -9.5) = 118.25

Calculate the square root of the right side: 10.874281585

Break this problem into two subproblems by setting 
(x + -9.5) equal to 10.874281585 and -10.874281585.

Subproblem 1

x + -9.5 = 10.874281585 Simplifying x + -9.5 = 10.874281585 Reorder the terms: -9.5 + x = 10.874281585 Solving -9.5 + x = 10.874281585 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 = 10.874281585 + 9.5 Combine like terms: -9.5 + 9.5 = 0.0 0.0 + x = 10.874281585 + 9.5 x = 10.874281585 + 9.5 Combine like terms: 10.874281585 + 9.5 = 20.374281585 x = 20.374281585 Simplifying x = 20.374281585

Subproblem 2

x + -9.5 = -10.874281585 Simplifying x + -9.5 = -10.874281585 Reorder the terms: -9.5 + x = -10.874281585 Solving -9.5 + x = -10.874281585 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 = -10.874281585 + 9.5 Combine like terms: -9.5 + 9.5 = 0.0 0.0 + x = -10.874281585 + 9.5 x = -10.874281585 + 9.5 Combine like terms: -10.874281585 + 9.5 = -1.374281585 x = -1.374281585 Simplifying x = -1.374281585

Solution

The solution to the problem is based on the solutions from the subproblems. x = {20.374281585, -1.374281585}

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