x^2+71x-180=0

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Solution for x^2+71x-180=0 equation:


Simplifying
x2 + 71x + -180 = 0

Reorder the terms:
-180 + 71x + x2 = 0

Solving
-180 + 71x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '180' to each side of the equation.
-180 + 71x + 180 + x2 = 0 + 180

Reorder the terms:
-180 + 180 + 71x + x2 = 0 + 180

Combine like terms: -180 + 180 = 0
0 + 71x + x2 = 0 + 180
71x + x2 = 0 + 180

Combine like terms: 0 + 180 = 180
71x + x2 = 180

The x term is 71x.  Take half its coefficient (35.5).
Square it (1260.25) and add it to both sides.

Add '1260.25' to each side of the equation.
71x + 1260.25 + x2 = 180 + 1260.25

Reorder the terms:
1260.25 + 71x + x2 = 180 + 1260.25

Combine like terms: 180 + 1260.25 = 1440.25
1260.25 + 71x + x2 = 1440.25

Factor a perfect square on the left side:
(x + 35.5)(x + 35.5) = 1440.25

Calculate the square root of the right side: 37.950625818

Break this problem into two subproblems by setting 
(x + 35.5) equal to 37.950625818 and -37.950625818.

Subproblem 1

x + 35.5 = 37.950625818 Simplifying x + 35.5 = 37.950625818 Reorder the terms: 35.5 + x = 37.950625818 Solving 35.5 + x = 37.950625818 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-35.5' to each side of the equation. 35.5 + -35.5 + x = 37.950625818 + -35.5 Combine like terms: 35.5 + -35.5 = 0.0 0.0 + x = 37.950625818 + -35.5 x = 37.950625818 + -35.5 Combine like terms: 37.950625818 + -35.5 = 2.450625818 x = 2.450625818 Simplifying x = 2.450625818

Subproblem 2

x + 35.5 = -37.950625818 Simplifying x + 35.5 = -37.950625818 Reorder the terms: 35.5 + x = -37.950625818 Solving 35.5 + x = -37.950625818 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-35.5' to each side of the equation. 35.5 + -35.5 + x = -37.950625818 + -35.5 Combine like terms: 35.5 + -35.5 = 0.0 0.0 + x = -37.950625818 + -35.5 x = -37.950625818 + -35.5 Combine like terms: -37.950625818 + -35.5 = -73.450625818 x = -73.450625818 Simplifying x = -73.450625818

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.450625818, -73.450625818}

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