2x^2+3x-300=0

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Solution for 2x^2+3x-300=0 equation:


Simplifying
2x2 + 3x + -300 = 0

Reorder the terms:
-300 + 3x + 2x2 = 0

Solving
-300 + 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'.
-150 + 1.5x + x2 = 0

Move the constant term to the right:

Add '150' to each side of the equation.
-150 + 1.5x + 150 + x2 = 0 + 150

Reorder the terms:
-150 + 150 + 1.5x + x2 = 0 + 150

Combine like terms: -150 + 150 = 0
0 + 1.5x + x2 = 0 + 150
1.5x + x2 = 0 + 150

Combine like terms: 0 + 150 = 150
1.5x + x2 = 150

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 = 150 + 0.5625

Reorder the terms:
0.5625 + 1.5x + x2 = 150 + 0.5625

Combine like terms: 150 + 0.5625 = 150.5625
0.5625 + 1.5x + x2 = 150.5625

Factor a perfect square on the left side:
(x + 0.75)(x + 0.75) = 150.5625

Calculate the square root of the right side: 12.270391192

Break this problem into two subproblems by setting 
(x + 0.75) equal to 12.270391192 and -12.270391192.

Subproblem 1

x + 0.75 = 12.270391192 Simplifying x + 0.75 = 12.270391192 Reorder the terms: 0.75 + x = 12.270391192 Solving 0.75 + x = 12.270391192 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 = 12.270391192 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + x = 12.270391192 + -0.75 x = 12.270391192 + -0.75 Combine like terms: 12.270391192 + -0.75 = 11.520391192 x = 11.520391192 Simplifying x = 11.520391192

Subproblem 2

x + 0.75 = -12.270391192 Simplifying x + 0.75 = -12.270391192 Reorder the terms: 0.75 + x = -12.270391192 Solving 0.75 + x = -12.270391192 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 = -12.270391192 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + x = -12.270391192 + -0.75 x = -12.270391192 + -0.75 Combine like terms: -12.270391192 + -0.75 = -13.020391192 x = -13.020391192 Simplifying x = -13.020391192

Solution

The solution to the problem is based on the solutions from the subproblems. x = {11.520391192, -13.020391192}

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