2x+4x^2=69

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Solution for 2x+4x^2=69 equation:


Simplifying
2x + 4x2 = 69

Solving
2x + 4x2 = 69

Solving for variable 'x'.

Reorder the terms:
-69 + 2x + 4x2 = 69 + -69

Combine like terms: 69 + -69 = 0
-69 + 2x + 4x2 = 0

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

Divide each side by '4'.
-17.25 + 0.5x + x2 = 0

Move the constant term to the right:

Add '17.25' to each side of the equation.
-17.25 + 0.5x + 17.25 + x2 = 0 + 17.25

Reorder the terms:
-17.25 + 17.25 + 0.5x + x2 = 0 + 17.25

Combine like terms: -17.25 + 17.25 = 0.00
0.00 + 0.5x + x2 = 0 + 17.25
0.5x + x2 = 0 + 17.25

Combine like terms: 0 + 17.25 = 17.25
0.5x + x2 = 17.25

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 = 17.25 + 0.0625

Reorder the terms:
0.0625 + 0.5x + x2 = 17.25 + 0.0625

Combine like terms: 17.25 + 0.0625 = 17.3125
0.0625 + 0.5x + x2 = 17.3125

Factor a perfect square on the left side:
(x + 0.25)(x + 0.25) = 17.3125

Calculate the square root of the right side: 4.160829244

Break this problem into two subproblems by setting 
(x + 0.25) equal to 4.160829244 and -4.160829244.

Subproblem 1

x + 0.25 = 4.160829244 Simplifying x + 0.25 = 4.160829244 Reorder the terms: 0.25 + x = 4.160829244 Solving 0.25 + x = 4.160829244 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 = 4.160829244 + -0.25 Combine like terms: 0.25 + -0.25 = 0.00 0.00 + x = 4.160829244 + -0.25 x = 4.160829244 + -0.25 Combine like terms: 4.160829244 + -0.25 = 3.910829244 x = 3.910829244 Simplifying x = 3.910829244

Subproblem 2

x + 0.25 = -4.160829244 Simplifying x + 0.25 = -4.160829244 Reorder the terms: 0.25 + x = -4.160829244 Solving 0.25 + x = -4.160829244 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 = -4.160829244 + -0.25 Combine like terms: 0.25 + -0.25 = 0.00 0.00 + x = -4.160829244 + -0.25 x = -4.160829244 + -0.25 Combine like terms: -4.160829244 + -0.25 = -4.410829244 x = -4.410829244 Simplifying x = -4.410829244

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.910829244, -4.410829244}

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