0.08x^2+120x-80=0

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Solution for 0.08x^2+120x-80=0 equation:


Simplifying
0.08x2 + 120x + -80 = 0

Reorder the terms:
-80 + 120x + 0.08x2 = 0

Solving
-80 + 120x + 0.08x2 = 0

Solving for variable 'x'.

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

Divide each side by '0.08'.
-1000 + 1500x + x2 = 0

Move the constant term to the right:

Add '1000' to each side of the equation.
-1000 + 1500x + 1000 + x2 = 0 + 1000

Reorder the terms:
-1000 + 1000 + 1500x + x2 = 0 + 1000

Combine like terms: -1000 + 1000 = 0
0 + 1500x + x2 = 0 + 1000
1500x + x2 = 0 + 1000

Combine like terms: 0 + 1000 = 1000
1500x + x2 = 1000

The x term is 1500x.  Take half its coefficient (750).
Square it (562500) and add it to both sides.

Add '562500' to each side of the equation.
1500x + 562500 + x2 = 1000 + 562500

Reorder the terms:
562500 + 1500x + x2 = 1000 + 562500

Combine like terms: 1000 + 562500 = 563500
562500 + 1500x + x2 = 563500

Factor a perfect square on the left side:
(x + 750)(x + 750) = 563500

Calculate the square root of the right side: 750.666370633

Break this problem into two subproblems by setting 
(x + 750) equal to 750.666370633 and -750.666370633.

Subproblem 1

x + 750 = 750.666370633 Simplifying x + 750 = 750.666370633 Reorder the terms: 750 + x = 750.666370633 Solving 750 + x = 750.666370633 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-750' to each side of the equation. 750 + -750 + x = 750.666370633 + -750 Combine like terms: 750 + -750 = 0 0 + x = 750.666370633 + -750 x = 750.666370633 + -750 Combine like terms: 750.666370633 + -750 = 0.666370633 x = 0.666370633 Simplifying x = 0.666370633

Subproblem 2

x + 750 = -750.666370633 Simplifying x + 750 = -750.666370633 Reorder the terms: 750 + x = -750.666370633 Solving 750 + x = -750.666370633 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-750' to each side of the equation. 750 + -750 + x = -750.666370633 + -750 Combine like terms: 750 + -750 = 0 0 + x = -750.666370633 + -750 x = -750.666370633 + -750 Combine like terms: -750.666370633 + -750 = -1500.666370633 x = -1500.666370633 Simplifying x = -1500.666370633

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.666370633, -1500.666370633}

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