2x^2+3x-225=0

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Solution for 2x^2+3x-225=0 equation:


Simplifying
2x2 + 3x + -225 = 0

Reorder the terms:
-225 + 3x + 2x2 = 0

Solving
-225 + 3x + 2x2 = 0

Solving for variable 'x'.

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

Divide each side by '2'.
-112.5 + 1.5x + x2 = 0

Move the constant term to the right:

Add '112.5' to each side of the equation.
-112.5 + 1.5x + 112.5 + x2 = 0 + 112.5

Reorder the terms:
-112.5 + 112.5 + 1.5x + x2 = 0 + 112.5

Combine like terms: -112.5 + 112.5 = 0.0
0.0 + 1.5x + x2 = 0 + 112.5
1.5x + x2 = 0 + 112.5

Combine like terms: 0 + 112.5 = 112.5
1.5x + x2 = 112.5

The x term is 1.5x.  Take half its coefficient (0.75).
Square it (0.5625) and add it to both sides.

Add '0.5625' to each side of the equation.
1.5x + 0.5625 + x2 = 112.5 + 0.5625

Reorder the terms:
0.5625 + 1.5x + x2 = 112.5 + 0.5625

Combine like terms: 112.5 + 0.5625 = 113.0625
0.5625 + 1.5x + x2 = 113.0625

Factor a perfect square on the left side:
(x + 0.75)(x + 0.75) = 113.0625

Calculate the square root of the right side: 10.633085159

Break this problem into two subproblems by setting 
(x + 0.75) equal to 10.633085159 and -10.633085159.

Subproblem 1

x + 0.75 = 10.633085159 Simplifying x + 0.75 = 10.633085159 Reorder the terms: 0.75 + x = 10.633085159 Solving 0.75 + x = 10.633085159 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.75' to each side of the equation. 0.75 + -0.75 + x = 10.633085159 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + x = 10.633085159 + -0.75 x = 10.633085159 + -0.75 Combine like terms: 10.633085159 + -0.75 = 9.883085159 x = 9.883085159 Simplifying x = 9.883085159

Subproblem 2

x + 0.75 = -10.633085159 Simplifying x + 0.75 = -10.633085159 Reorder the terms: 0.75 + x = -10.633085159 Solving 0.75 + x = -10.633085159 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.75' to each side of the equation. 0.75 + -0.75 + x = -10.633085159 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + x = -10.633085159 + -0.75 x = -10.633085159 + -0.75 Combine like terms: -10.633085159 + -0.75 = -11.383085159 x = -11.383085159 Simplifying x = -11.383085159

Solution

The solution to the problem is based on the solutions from the subproblems. x = {9.883085159, -11.383085159}

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