150=x+2x^2

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Solution for 150=x+2x^2 equation:


Simplifying
150 = x + 2x2

Solving
150 = x + 2x2

Solving for variable 'x'.

Reorder the terms:
150 + -1x + -2x2 = x + -1x + 2x2 + -2x2

Combine like terms: x + -1x = 0
150 + -1x + -2x2 = 0 + 2x2 + -2x2
150 + -1x + -2x2 = 2x2 + -2x2

Combine like terms: 2x2 + -2x2 = 0
150 + -1x + -2x2 = 0

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

Divide each side by '-2'.
-75 + 0.5x + x2 = 0

Move the constant term to the right:

Add '75' to each side of the equation.
-75 + 0.5x + 75 + x2 = 0 + 75

Reorder the terms:
-75 + 75 + 0.5x + x2 = 0 + 75

Combine like terms: -75 + 75 = 0
0 + 0.5x + x2 = 0 + 75
0.5x + x2 = 0 + 75

Combine like terms: 0 + 75 = 75
0.5x + x2 = 75

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 = 75 + 0.0625

Reorder the terms:
0.0625 + 0.5x + x2 = 75 + 0.0625

Combine like terms: 75 + 0.0625 = 75.0625
0.0625 + 0.5x + x2 = 75.0625

Factor a perfect square on the left side:
(x + 0.25)(x + 0.25) = 75.0625

Calculate the square root of the right side: 8.663861726

Break this problem into two subproblems by setting 
(x + 0.25) equal to 8.663861726 and -8.663861726.

Subproblem 1

x + 0.25 = 8.663861726 Simplifying x + 0.25 = 8.663861726 Reorder the terms: 0.25 + x = 8.663861726 Solving 0.25 + x = 8.663861726 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 = 8.663861726 + -0.25 Combine like terms: 0.25 + -0.25 = 0.00 0.00 + x = 8.663861726 + -0.25 x = 8.663861726 + -0.25 Combine like terms: 8.663861726 + -0.25 = 8.413861726 x = 8.413861726 Simplifying x = 8.413861726

Subproblem 2

x + 0.25 = -8.663861726 Simplifying x + 0.25 = -8.663861726 Reorder the terms: 0.25 + x = -8.663861726 Solving 0.25 + x = -8.663861726 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 = -8.663861726 + -0.25 Combine like terms: 0.25 + -0.25 = 0.00 0.00 + x = -8.663861726 + -0.25 x = -8.663861726 + -0.25 Combine like terms: -8.663861726 + -0.25 = -8.913861726 x = -8.913861726 Simplifying x = -8.913861726

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8.413861726, -8.913861726}

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