2x^2+5x-300=0

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Solution for 2x^2+5x-300=0 equation:


Simplifying
2x2 + 5x + -300 = 0

Reorder the terms:
-300 + 5x + 2x2 = 0

Solving
-300 + 5x + 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 + 2.5x + x2 = 0

Move the constant term to the right:

Add '150' to each side of the equation.
-150 + 2.5x + 150 + x2 = 0 + 150

Reorder the terms:
-150 + 150 + 2.5x + x2 = 0 + 150

Combine like terms: -150 + 150 = 0
0 + 2.5x + x2 = 0 + 150
2.5x + x2 = 0 + 150

Combine like terms: 0 + 150 = 150
2.5x + x2 = 150

The x term is 2.5x.  Take half its coefficient (1.25).
Square it (1.5625) and add it to both sides.

Add '1.5625' to each side of the equation.
2.5x + 1.5625 + x2 = 150 + 1.5625

Reorder the terms:
1.5625 + 2.5x + x2 = 150 + 1.5625

Combine like terms: 150 + 1.5625 = 151.5625
1.5625 + 2.5x + x2 = 151.5625

Factor a perfect square on the left side:
(x + 1.25)(x + 1.25) = 151.5625

Calculate the square root of the right side: 12.311072252

Break this problem into two subproblems by setting 
(x + 1.25) equal to 12.311072252 and -12.311072252.

Subproblem 1

x + 1.25 = 12.311072252 Simplifying x + 1.25 = 12.311072252 Reorder the terms: 1.25 + x = 12.311072252 Solving 1.25 + x = 12.311072252 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.25' to each side of the equation. 1.25 + -1.25 + x = 12.311072252 + -1.25 Combine like terms: 1.25 + -1.25 = 0.00 0.00 + x = 12.311072252 + -1.25 x = 12.311072252 + -1.25 Combine like terms: 12.311072252 + -1.25 = 11.061072252 x = 11.061072252 Simplifying x = 11.061072252

Subproblem 2

x + 1.25 = -12.311072252 Simplifying x + 1.25 = -12.311072252 Reorder the terms: 1.25 + x = -12.311072252 Solving 1.25 + x = -12.311072252 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.25' to each side of the equation. 1.25 + -1.25 + x = -12.311072252 + -1.25 Combine like terms: 1.25 + -1.25 = 0.00 0.00 + x = -12.311072252 + -1.25 x = -12.311072252 + -1.25 Combine like terms: -12.311072252 + -1.25 = -13.561072252 x = -13.561072252 Simplifying x = -13.561072252

Solution

The solution to the problem is based on the solutions from the subproblems. x = {11.061072252, -13.561072252}

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