2x^2-1.5x-26=0

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Solution for 2x^2-1.5x-26=0 equation:


Simplifying
2x2 + -1.5x + -26 = 0

Reorder the terms:
-26 + -1.5x + 2x2 = 0

Solving
-26 + -1.5x + 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'.
-13 + -0.75x + x2 = 0

Move the constant term to the right:

Add '13' to each side of the equation.
-13 + -0.75x + 13 + x2 = 0 + 13

Reorder the terms:
-13 + 13 + -0.75x + x2 = 0 + 13

Combine like terms: -13 + 13 = 0
0 + -0.75x + x2 = 0 + 13
-0.75x + x2 = 0 + 13

Combine like terms: 0 + 13 = 13
-0.75x + x2 = 13

The x term is -0.75x.  Take half its coefficient (-0.375).
Square it (0.140625) and add it to both sides.

Add '0.140625' to each side of the equation.
-0.75x + 0.140625 + x2 = 13 + 0.140625

Reorder the terms:
0.140625 + -0.75x + x2 = 13 + 0.140625

Combine like terms: 13 + 0.140625 = 13.140625
0.140625 + -0.75x + x2 = 13.140625

Factor a perfect square on the left side:
(x + -0.375)(x + -0.375) = 13.140625

Calculate the square root of the right side: 3.625

Break this problem into two subproblems by setting 
(x + -0.375) equal to 3.625 and -3.625.

Subproblem 1

x + -0.375 = 3.625 Simplifying x + -0.375 = 3.625 Reorder the terms: -0.375 + x = 3.625 Solving -0.375 + x = 3.625 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.375' to each side of the equation. -0.375 + 0.375 + x = 3.625 + 0.375 Combine like terms: -0.375 + 0.375 = 0.000 0.000 + x = 3.625 + 0.375 x = 3.625 + 0.375 Combine like terms: 3.625 + 0.375 = 4 x = 4 Simplifying x = 4

Subproblem 2

x + -0.375 = -3.625 Simplifying x + -0.375 = -3.625 Reorder the terms: -0.375 + x = -3.625 Solving -0.375 + x = -3.625 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.375' to each side of the equation. -0.375 + 0.375 + x = -3.625 + 0.375 Combine like terms: -0.375 + 0.375 = 0.000 0.000 + x = -3.625 + 0.375 x = -3.625 + 0.375 Combine like terms: -3.625 + 0.375 = -3.25 x = -3.25 Simplifying x = -3.25

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4, -3.25}

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