x^2+26x=80

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Solution for x^2+26x=80 equation:


Simplifying
x2 + 26x = 80

Reorder the terms:
26x + x2 = 80

Solving
26x + x2 = 80

Solving for variable 'x'.

Reorder the terms:
-80 + 26x + x2 = 80 + -80

Combine like terms: 80 + -80 = 0
-80 + 26x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '80' to each side of the equation.
-80 + 26x + 80 + x2 = 0 + 80

Reorder the terms:
-80 + 80 + 26x + x2 = 0 + 80

Combine like terms: -80 + 80 = 0
0 + 26x + x2 = 0 + 80
26x + x2 = 0 + 80

Combine like terms: 0 + 80 = 80
26x + x2 = 80

The x term is 26x.  Take half its coefficient (13).
Square it (169) and add it to both sides.

Add '169' to each side of the equation.
26x + 169 + x2 = 80 + 169

Reorder the terms:
169 + 26x + x2 = 80 + 169

Combine like terms: 80 + 169 = 249
169 + 26x + x2 = 249

Factor a perfect square on the left side:
(x + 13)(x + 13) = 249

Calculate the square root of the right side: 15.779733838

Break this problem into two subproblems by setting 
(x + 13) equal to 15.779733838 and -15.779733838.

Subproblem 1

x + 13 = 15.779733838 Simplifying x + 13 = 15.779733838 Reorder the terms: 13 + x = 15.779733838 Solving 13 + x = 15.779733838 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-13' to each side of the equation. 13 + -13 + x = 15.779733838 + -13 Combine like terms: 13 + -13 = 0 0 + x = 15.779733838 + -13 x = 15.779733838 + -13 Combine like terms: 15.779733838 + -13 = 2.779733838 x = 2.779733838 Simplifying x = 2.779733838

Subproblem 2

x + 13 = -15.779733838 Simplifying x + 13 = -15.779733838 Reorder the terms: 13 + x = -15.779733838 Solving 13 + x = -15.779733838 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-13' to each side of the equation. 13 + -13 + x = -15.779733838 + -13 Combine like terms: 13 + -13 = 0 0 + x = -15.779733838 + -13 x = -15.779733838 + -13 Combine like terms: -15.779733838 + -13 = -28.779733838 x = -28.779733838 Simplifying x = -28.779733838

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.779733838, -28.779733838}

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