5x^2+3x-120=0

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Solution for 5x^2+3x-120=0 equation:


Simplifying
5x2 + 3x + -120 = 0

Reorder the terms:
-120 + 3x + 5x2 = 0

Solving
-120 + 3x + 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 + 0.6x + x2 = 0

Move the constant term to the right:

Add '24' to each side of the equation.
-24 + 0.6x + 24 + x2 = 0 + 24

Reorder the terms:
-24 + 24 + 0.6x + x2 = 0 + 24

Combine like terms: -24 + 24 = 0
0 + 0.6x + x2 = 0 + 24
0.6x + x2 = 0 + 24

Combine like terms: 0 + 24 = 24
0.6x + x2 = 24

The x term is 0.6x.  Take half its coefficient (0.3).
Square it (0.09) and add it to both sides.

Add '0.09' to each side of the equation.
0.6x + 0.09 + x2 = 24 + 0.09

Reorder the terms:
0.09 + 0.6x + x2 = 24 + 0.09

Combine like terms: 24 + 0.09 = 24.09
0.09 + 0.6x + x2 = 24.09

Factor a perfect square on the left side:
(x + 0.3)(x + 0.3) = 24.09

Calculate the square root of the right side: 4.908156477

Break this problem into two subproblems by setting 
(x + 0.3) equal to 4.908156477 and -4.908156477.

Subproblem 1

x + 0.3 = 4.908156477 Simplifying x + 0.3 = 4.908156477 Reorder the terms: 0.3 + x = 4.908156477 Solving 0.3 + x = 4.908156477 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.3' to each side of the equation. 0.3 + -0.3 + x = 4.908156477 + -0.3 Combine like terms: 0.3 + -0.3 = 0.0 0.0 + x = 4.908156477 + -0.3 x = 4.908156477 + -0.3 Combine like terms: 4.908156477 + -0.3 = 4.608156477 x = 4.608156477 Simplifying x = 4.608156477

Subproblem 2

x + 0.3 = -4.908156477 Simplifying x + 0.3 = -4.908156477 Reorder the terms: 0.3 + x = -4.908156477 Solving 0.3 + x = -4.908156477 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.3' to each side of the equation. 0.3 + -0.3 + x = -4.908156477 + -0.3 Combine like terms: 0.3 + -0.3 = 0.0 0.0 + x = -4.908156477 + -0.3 x = -4.908156477 + -0.3 Combine like terms: -4.908156477 + -0.3 = -5.208156477 x = -5.208156477 Simplifying x = -5.208156477

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.608156477, -5.208156477}

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