2.4x^2+1.2x=36

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Solution for 2.4x^2+1.2x=36 equation:


Simplifying
2.4x2 + 1.2x = 36

Reorder the terms:
1.2x + 2.4x2 = 36

Solving
1.2x + 2.4x2 = 36

Solving for variable 'x'.

Reorder the terms:
-36 + 1.2x + 2.4x2 = 36 + -36

Combine like terms: 36 + -36 = 0
-36 + 1.2x + 2.4x2 = 0

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

Divide each side by '2.4'.
-15 + 0.5x + x2 = 0

Move the constant term to the right:

Add '15' to each side of the equation.
-15 + 0.5x + 15 + x2 = 0 + 15

Reorder the terms:
-15 + 15 + 0.5x + x2 = 0 + 15

Combine like terms: -15 + 15 = 0
0 + 0.5x + x2 = 0 + 15
0.5x + x2 = 0 + 15

Combine like terms: 0 + 15 = 15
0.5x + x2 = 15

The x term is 0.5x.  Take half its coefficient (0.25).
Square it (0.0625) and add it to both sides.

Add '0.0625' to each side of the equation.
0.5x + 0.0625 + x2 = 15 + 0.0625

Reorder the terms:
0.0625 + 0.5x + x2 = 15 + 0.0625

Combine like terms: 15 + 0.0625 = 15.0625
0.0625 + 0.5x + x2 = 15.0625

Factor a perfect square on the left side:
(x + 0.25)(x + 0.25) = 15.0625

Calculate the square root of the right side: 3.881043674

Break this problem into two subproblems by setting 
(x + 0.25) equal to 3.881043674 and -3.881043674.

Subproblem 1

x + 0.25 = 3.881043674 Simplifying x + 0.25 = 3.881043674 Reorder the terms: 0.25 + x = 3.881043674 Solving 0.25 + x = 3.881043674 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.25' to each side of the equation. 0.25 + -0.25 + x = 3.881043674 + -0.25 Combine like terms: 0.25 + -0.25 = 0.00 0.00 + x = 3.881043674 + -0.25 x = 3.881043674 + -0.25 Combine like terms: 3.881043674 + -0.25 = 3.631043674 x = 3.631043674 Simplifying x = 3.631043674

Subproblem 2

x + 0.25 = -3.881043674 Simplifying x + 0.25 = -3.881043674 Reorder the terms: 0.25 + x = -3.881043674 Solving 0.25 + x = -3.881043674 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.25' to each side of the equation. 0.25 + -0.25 + x = -3.881043674 + -0.25 Combine like terms: 0.25 + -0.25 = 0.00 0.00 + x = -3.881043674 + -0.25 x = -3.881043674 + -0.25 Combine like terms: -3.881043674 + -0.25 = -4.131043674 x = -4.131043674 Simplifying x = -4.131043674

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.631043674, -4.131043674}

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