5x^2+6x-120=0

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Solution for 5x^2+6x-120=0 equation:


Simplifying
5x2 + 6x + -120 = 0

Reorder the terms:
-120 + 6x + 5x2 = 0

Solving
-120 + 6x + 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'.
-24 + 1.2x + x2 = 0

Move the constant term to the right:

Add '24' to each side of the equation.
-24 + 1.2x + 24 + x2 = 0 + 24

Reorder the terms:
-24 + 24 + 1.2x + x2 = 0 + 24

Combine like terms: -24 + 24 = 0
0 + 1.2x + x2 = 0 + 24
1.2x + x2 = 0 + 24

Combine like terms: 0 + 24 = 24
1.2x + x2 = 24

The x term is 1.2x.  Take half its coefficient (0.6).
Square it (0.36) and add it to both sides.

Add '0.36' to each side of the equation.
1.2x + 0.36 + x2 = 24 + 0.36

Reorder the terms:
0.36 + 1.2x + x2 = 24 + 0.36

Combine like terms: 24 + 0.36 = 24.36
0.36 + 1.2x + x2 = 24.36

Factor a perfect square on the left side:
(x + 0.6)(x + 0.6) = 24.36

Calculate the square root of the right side: 4.935585072

Break this problem into two subproblems by setting 
(x + 0.6) equal to 4.935585072 and -4.935585072.

Subproblem 1

x + 0.6 = 4.935585072 Simplifying x + 0.6 = 4.935585072 Reorder the terms: 0.6 + x = 4.935585072 Solving 0.6 + x = 4.935585072 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.6' to each side of the equation. 0.6 + -0.6 + x = 4.935585072 + -0.6 Combine like terms: 0.6 + -0.6 = 0.0 0.0 + x = 4.935585072 + -0.6 x = 4.935585072 + -0.6 Combine like terms: 4.935585072 + -0.6 = 4.335585072 x = 4.335585072 Simplifying x = 4.335585072

Subproblem 2

x + 0.6 = -4.935585072 Simplifying x + 0.6 = -4.935585072 Reorder the terms: 0.6 + x = -4.935585072 Solving 0.6 + x = -4.935585072 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.6' to each side of the equation. 0.6 + -0.6 + x = -4.935585072 + -0.6 Combine like terms: 0.6 + -0.6 = 0.0 0.0 + x = -4.935585072 + -0.6 x = -4.935585072 + -0.6 Combine like terms: -4.935585072 + -0.6 = -5.535585072 x = -5.535585072 Simplifying x = -5.535585072

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.335585072, -5.535585072}

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