x+2x^2=1200

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Solution for x+2x^2=1200 equation:


Simplifying
x + 2x2 = 1200

Solving
x + 2x2 = 1200

Solving for variable 'x'.

Reorder the terms:
-1200 + x + 2x2 = 1200 + -1200

Combine like terms: 1200 + -1200 = 0
-1200 + x + 2x2 = 0

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

Divide each side by '2'.
-600 + 0.5x + x2 = 0

Move the constant term to the right:

Add '600' to each side of the equation.
-600 + 0.5x + 600 + x2 = 0 + 600

Reorder the terms:
-600 + 600 + 0.5x + x2 = 0 + 600

Combine like terms: -600 + 600 = 0
0 + 0.5x + x2 = 0 + 600
0.5x + x2 = 0 + 600

Combine like terms: 0 + 600 = 600
0.5x + x2 = 600

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

Add '0.25' to each side of the equation.
0.5x + 0.25 + x2 = 600 + 0.25

Reorder the terms:
0.25 + 0.5x + x2 = 600 + 0.25

Combine like terms: 600 + 0.25 = 600.25
0.25 + 0.5x + x2 = 600.25

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 600.25

Calculate the square root of the right side: 24.5

Break this problem into two subproblems by setting 
(x + 0.5) equal to 24.5 and -24.5.

Subproblem 1

x + 0.5 = 24.5 Simplifying x + 0.5 = 24.5 Reorder the terms: 0.5 + x = 24.5 Solving 0.5 + x = 24.5 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = 24.5 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 24.5 + -0.5 x = 24.5 + -0.5 Combine like terms: 24.5 + -0.5 = 24 x = 24 Simplifying x = 24

Subproblem 2

x + 0.5 = -24.5 Simplifying x + 0.5 = -24.5 Reorder the terms: 0.5 + x = -24.5 Solving 0.5 + x = -24.5 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = -24.5 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -24.5 + -0.5 x = -24.5 + -0.5 Combine like terms: -24.5 + -0.5 = -25 x = -25 Simplifying x = -25

Solution

The solution to the problem is based on the solutions from the subproblems. x = {24, -25}

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