5x^2+14x-120=0

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Solution for 5x^2+14x-120=0 equation:


Simplifying
5x2 + 14x + -120 = 0

Reorder the terms:
-120 + 14x + 5x2 = 0

Solving
-120 + 14x + 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 + 2.8x + x2 = 0

Move the constant term to the right:

Add '24' to each side of the equation.
-24 + 2.8x + 24 + x2 = 0 + 24

Reorder the terms:
-24 + 24 + 2.8x + x2 = 0 + 24

Combine like terms: -24 + 24 = 0
0 + 2.8x + x2 = 0 + 24
2.8x + x2 = 0 + 24

Combine like terms: 0 + 24 = 24
2.8x + x2 = 24

The x term is 2.8x.  Take half its coefficient (1.4).
Square it (1.96) and add it to both sides.

Add '1.96' to each side of the equation.
2.8x + 1.96 + x2 = 24 + 1.96

Reorder the terms:
1.96 + 2.8x + x2 = 24 + 1.96

Combine like terms: 24 + 1.96 = 25.96
1.96 + 2.8x + x2 = 25.96

Factor a perfect square on the left side:
(x + 1.4)(x + 1.4) = 25.96

Calculate the square root of the right side: 5.095095681

Break this problem into two subproblems by setting 
(x + 1.4) equal to 5.095095681 and -5.095095681.

Subproblem 1

x + 1.4 = 5.095095681 Simplifying x + 1.4 = 5.095095681 Reorder the terms: 1.4 + x = 5.095095681 Solving 1.4 + x = 5.095095681 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.4' to each side of the equation. 1.4 + -1.4 + x = 5.095095681 + -1.4 Combine like terms: 1.4 + -1.4 = 0.0 0.0 + x = 5.095095681 + -1.4 x = 5.095095681 + -1.4 Combine like terms: 5.095095681 + -1.4 = 3.695095681 x = 3.695095681 Simplifying x = 3.695095681

Subproblem 2

x + 1.4 = -5.095095681 Simplifying x + 1.4 = -5.095095681 Reorder the terms: 1.4 + x = -5.095095681 Solving 1.4 + x = -5.095095681 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.4' to each side of the equation. 1.4 + -1.4 + x = -5.095095681 + -1.4 Combine like terms: 1.4 + -1.4 = 0.0 0.0 + x = -5.095095681 + -1.4 x = -5.095095681 + -1.4 Combine like terms: -5.095095681 + -1.4 = -6.495095681 x = -6.495095681 Simplifying x = -6.495095681

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.695095681, -6.495095681}

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