3x+2x^2-26=0

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Solution for 3x+2x^2-26=0 equation:


Simplifying
3x + 2x2 + -26 = 0

Reorder the terms:
-26 + 3x + 2x2 = 0

Solving
-26 + 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'.
-13 + 1.5x + x2 = 0

Move the constant term to the right:

Add '13' to each side of the equation.
-13 + 1.5x + 13 + x2 = 0 + 13

Reorder the terms:
-13 + 13 + 1.5x + x2 = 0 + 13

Combine like terms: -13 + 13 = 0
0 + 1.5x + x2 = 0 + 13
1.5x + x2 = 0 + 13

Combine like terms: 0 + 13 = 13
1.5x + x2 = 13

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 = 13 + 0.5625

Reorder the terms:
0.5625 + 1.5x + x2 = 13 + 0.5625

Combine like terms: 13 + 0.5625 = 13.5625
0.5625 + 1.5x + x2 = 13.5625

Factor a perfect square on the left side:
(x + 0.75)(x + 0.75) = 13.5625

Calculate the square root of the right side: 3.682729966

Break this problem into two subproblems by setting 
(x + 0.75) equal to 3.682729966 and -3.682729966.

Subproblem 1

x + 0.75 = 3.682729966 Simplifying x + 0.75 = 3.682729966 Reorder the terms: 0.75 + x = 3.682729966 Solving 0.75 + x = 3.682729966 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 = 3.682729966 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + x = 3.682729966 + -0.75 x = 3.682729966 + -0.75 Combine like terms: 3.682729966 + -0.75 = 2.932729966 x = 2.932729966 Simplifying x = 2.932729966

Subproblem 2

x + 0.75 = -3.682729966 Simplifying x + 0.75 = -3.682729966 Reorder the terms: 0.75 + x = -3.682729966 Solving 0.75 + x = -3.682729966 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 = -3.682729966 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + x = -3.682729966 + -0.75 x = -3.682729966 + -0.75 Combine like terms: -3.682729966 + -0.75 = -4.432729966 x = -4.432729966 Simplifying x = -4.432729966

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.932729966, -4.432729966}

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