5x^2+12x-80=0

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Solution for 5x^2+12x-80=0 equation:


Simplifying
5x2 + 12x + -80 = 0

Reorder the terms:
-80 + 12x + 5x2 = 0

Solving
-80 + 12x + 5x2 = 0

Solving for variable 'x'.

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

Divide each side by '5'.
-16 + 2.4x + x2 = 0

Move the constant term to the right:

Add '16' to each side of the equation.
-16 + 2.4x + 16 + x2 = 0 + 16

Reorder the terms:
-16 + 16 + 2.4x + x2 = 0 + 16

Combine like terms: -16 + 16 = 0
0 + 2.4x + x2 = 0 + 16
2.4x + x2 = 0 + 16

Combine like terms: 0 + 16 = 16
2.4x + x2 = 16

The x term is 2.4x.  Take half its coefficient (1.2).
Square it (1.44) and add it to both sides.

Add '1.44' to each side of the equation.
2.4x + 1.44 + x2 = 16 + 1.44

Reorder the terms:
1.44 + 2.4x + x2 = 16 + 1.44

Combine like terms: 16 + 1.44 = 17.44
1.44 + 2.4x + x2 = 17.44

Factor a perfect square on the left side:
(x + 1.2)(x + 1.2) = 17.44

Calculate the square root of the right side: 4.176122604

Break this problem into two subproblems by setting 
(x + 1.2) equal to 4.176122604 and -4.176122604.

Subproblem 1

x + 1.2 = 4.176122604 Simplifying x + 1.2 = 4.176122604 Reorder the terms: 1.2 + x = 4.176122604 Solving 1.2 + x = 4.176122604 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.2' to each side of the equation. 1.2 + -1.2 + x = 4.176122604 + -1.2 Combine like terms: 1.2 + -1.2 = 0.0 0.0 + x = 4.176122604 + -1.2 x = 4.176122604 + -1.2 Combine like terms: 4.176122604 + -1.2 = 2.976122604 x = 2.976122604 Simplifying x = 2.976122604

Subproblem 2

x + 1.2 = -4.176122604 Simplifying x + 1.2 = -4.176122604 Reorder the terms: 1.2 + x = -4.176122604 Solving 1.2 + x = -4.176122604 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.2' to each side of the equation. 1.2 + -1.2 + x = -4.176122604 + -1.2 Combine like terms: 1.2 + -1.2 = 0.0 0.0 + x = -4.176122604 + -1.2 x = -4.176122604 + -1.2 Combine like terms: -4.176122604 + -1.2 = -5.376122604 x = -5.376122604 Simplifying x = -5.376122604

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.976122604, -5.376122604}

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