0.6x^2+1.2x=31.5

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Solution for 0.6x^2+1.2x=31.5 equation:


Simplifying
0.6x2 + 1.2x = 31.5

Reorder the terms:
1.2x + 0.6x2 = 31.5

Solving
1.2x + 0.6x2 = 31.5

Solving for variable 'x'.

Reorder the terms:
-31.5 + 1.2x + 0.6x2 = 31.5 + -31.5

Combine like terms: 31.5 + -31.5 = 0.0
-31.5 + 1.2x + 0.6x2 = 0.0

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

Divide each side by '0.6'.
-52.5 + 2x + x2 = 0

Move the constant term to the right:

Add '52.5' to each side of the equation.
-52.5 + 2x + 52.5 + x2 = 0 + 52.5

Reorder the terms:
-52.5 + 52.5 + 2x + x2 = 0 + 52.5

Combine like terms: -52.5 + 52.5 = 0.0
0.0 + 2x + x2 = 0 + 52.5
2x + x2 = 0 + 52.5

Combine like terms: 0 + 52.5 = 52.5
2x + x2 = 52.5

The x term is 2x.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2x + 1 + x2 = 52.5 + 1

Reorder the terms:
1 + 2x + x2 = 52.5 + 1

Combine like terms: 52.5 + 1 = 53.5
1 + 2x + x2 = 53.5

Factor a perfect square on the left side:
(x + 1)(x + 1) = 53.5

Calculate the square root of the right side: 7.314369419

Break this problem into two subproblems by setting 
(x + 1) equal to 7.314369419 and -7.314369419.

Subproblem 1

x + 1 = 7.314369419 Simplifying x + 1 = 7.314369419 Reorder the terms: 1 + x = 7.314369419 Solving 1 + x = 7.314369419 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = 7.314369419 + -1 Combine like terms: 1 + -1 = 0 0 + x = 7.314369419 + -1 x = 7.314369419 + -1 Combine like terms: 7.314369419 + -1 = 6.314369419 x = 6.314369419 Simplifying x = 6.314369419

Subproblem 2

x + 1 = -7.314369419 Simplifying x + 1 = -7.314369419 Reorder the terms: 1 + x = -7.314369419 Solving 1 + x = -7.314369419 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = -7.314369419 + -1 Combine like terms: 1 + -1 = 0 0 + x = -7.314369419 + -1 x = -7.314369419 + -1 Combine like terms: -7.314369419 + -1 = -8.314369419 x = -8.314369419 Simplifying x = -8.314369419

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.314369419, -8.314369419}

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