169=28.18x+x^2

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Solution for 169=28.18x+x^2 equation:


Simplifying
169 = 28.18x + x2

Solving
169 = 28.18x + x2

Solving for variable 'x'.

Reorder the terms:
169 + -28.18x + -1x2 = 28.18x + -28.18x + x2 + -1x2

Combine like terms: 28.18x + -28.18x = 0.00
169 + -28.18x + -1x2 = 0.00 + x2 + -1x2
169 + -28.18x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
169 + -28.18x + -1x2 = 0

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

Divide each side by '-1'.
-169 + 28.18x + x2 = 0

Move the constant term to the right:

Add '169' to each side of the equation.
-169 + 28.18x + 169 + x2 = 0 + 169

Reorder the terms:
-169 + 169 + 28.18x + x2 = 0 + 169

Combine like terms: -169 + 169 = 0
0 + 28.18x + x2 = 0 + 169
28.18x + x2 = 0 + 169

Combine like terms: 0 + 169 = 169
28.18x + x2 = 169

The x term is 28.18x.  Take half its coefficient (14.09).
Square it (198.5281) and add it to both sides.

Add '198.5281' to each side of the equation.
28.18x + 198.5281 + x2 = 169 + 198.5281

Reorder the terms:
198.5281 + 28.18x + x2 = 169 + 198.5281

Combine like terms: 169 + 198.5281 = 367.5281
198.5281 + 28.18x + x2 = 367.5281

Factor a perfect square on the left side:
(x + 14.09)(x + 14.09) = 367.5281

Calculate the square root of the right side: 19.171022404

Break this problem into two subproblems by setting 
(x + 14.09) equal to 19.171022404 and -19.171022404.

Subproblem 1

x + 14.09 = 19.171022404 Simplifying x + 14.09 = 19.171022404 Reorder the terms: 14.09 + x = 19.171022404 Solving 14.09 + x = 19.171022404 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-14.09' to each side of the equation. 14.09 + -14.09 + x = 19.171022404 + -14.09 Combine like terms: 14.09 + -14.09 = 0.00 0.00 + x = 19.171022404 + -14.09 x = 19.171022404 + -14.09 Combine like terms: 19.171022404 + -14.09 = 5.081022404 x = 5.081022404 Simplifying x = 5.081022404

Subproblem 2

x + 14.09 = -19.171022404 Simplifying x + 14.09 = -19.171022404 Reorder the terms: 14.09 + x = -19.171022404 Solving 14.09 + x = -19.171022404 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-14.09' to each side of the equation. 14.09 + -14.09 + x = -19.171022404 + -14.09 Combine like terms: 14.09 + -14.09 = 0.00 0.00 + x = -19.171022404 + -14.09 x = -19.171022404 + -14.09 Combine like terms: -19.171022404 + -14.09 = -33.261022404 x = -33.261022404 Simplifying x = -33.261022404

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.081022404, -33.261022404}

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