x^2-3x-5=180

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Solution for x^2-3x-5=180 equation:


Simplifying
x2 + -3x + -5 = 180

Reorder the terms:
-5 + -3x + x2 = 180

Solving
-5 + -3x + x2 = 180

Solving for variable 'x'.

Reorder the terms:
-5 + -180 + -3x + x2 = 180 + -180

Combine like terms: -5 + -180 = -185
-185 + -3x + x2 = 180 + -180

Combine like terms: 180 + -180 = 0
-185 + -3x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '185' to each side of the equation.
-185 + -3x + 185 + x2 = 0 + 185

Reorder the terms:
-185 + 185 + -3x + x2 = 0 + 185

Combine like terms: -185 + 185 = 0
0 + -3x + x2 = 0 + 185
-3x + x2 = 0 + 185

Combine like terms: 0 + 185 = 185
-3x + x2 = 185

The x term is -3x.  Take half its coefficient (-1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
-3x + 2.25 + x2 = 185 + 2.25

Reorder the terms:
2.25 + -3x + x2 = 185 + 2.25

Combine like terms: 185 + 2.25 = 187.25
2.25 + -3x + x2 = 187.25

Factor a perfect square on the left side:
(x + -1.5)(x + -1.5) = 187.25

Calculate the square root of the right side: 13.683932183

Break this problem into two subproblems by setting 
(x + -1.5) equal to 13.683932183 and -13.683932183.

Subproblem 1

x + -1.5 = 13.683932183 Simplifying x + -1.5 = 13.683932183 Reorder the terms: -1.5 + x = 13.683932183 Solving -1.5 + x = 13.683932183 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + x = 13.683932183 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = 13.683932183 + 1.5 x = 13.683932183 + 1.5 Combine like terms: 13.683932183 + 1.5 = 15.183932183 x = 15.183932183 Simplifying x = 15.183932183

Subproblem 2

x + -1.5 = -13.683932183 Simplifying x + -1.5 = -13.683932183 Reorder the terms: -1.5 + x = -13.683932183 Solving -1.5 + x = -13.683932183 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + x = -13.683932183 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = -13.683932183 + 1.5 x = -13.683932183 + 1.5 Combine like terms: -13.683932183 + 1.5 = -12.183932183 x = -12.183932183 Simplifying x = -12.183932183

Solution

The solution to the problem is based on the solutions from the subproblems. x = {15.183932183, -12.183932183}

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