2X^2-9X-88=0

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Solution for 2X^2-9X-88=0 equation:


Simplifying
2X2 + -9X + -88 = 0

Reorder the terms:
-88 + -9X + 2X2 = 0

Solving
-88 + -9X + 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'.
-44 + -4.5X + X2 = 0

Move the constant term to the right:

Add '44' to each side of the equation.
-44 + -4.5X + 44 + X2 = 0 + 44

Reorder the terms:
-44 + 44 + -4.5X + X2 = 0 + 44

Combine like terms: -44 + 44 = 0
0 + -4.5X + X2 = 0 + 44
-4.5X + X2 = 0 + 44

Combine like terms: 0 + 44 = 44
-4.5X + X2 = 44

The X term is -4.5X.  Take half its coefficient (-2.25).
Square it (5.0625) and add it to both sides.

Add '5.0625' to each side of the equation.
-4.5X + 5.0625 + X2 = 44 + 5.0625

Reorder the terms:
5.0625 + -4.5X + X2 = 44 + 5.0625

Combine like terms: 44 + 5.0625 = 49.0625
5.0625 + -4.5X + X2 = 49.0625

Factor a perfect square on the left side:
(X + -2.25)(X + -2.25) = 49.0625

Calculate the square root of the right side: 7.004462863

Break this problem into two subproblems by setting 
(X + -2.25) equal to 7.004462863 and -7.004462863.

Subproblem 1

X + -2.25 = 7.004462863 Simplifying X + -2.25 = 7.004462863 Reorder the terms: -2.25 + X = 7.004462863 Solving -2.25 + X = 7.004462863 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '2.25' to each side of the equation. -2.25 + 2.25 + X = 7.004462863 + 2.25 Combine like terms: -2.25 + 2.25 = 0.00 0.00 + X = 7.004462863 + 2.25 X = 7.004462863 + 2.25 Combine like terms: 7.004462863 + 2.25 = 9.254462863 X = 9.254462863 Simplifying X = 9.254462863

Subproblem 2

X + -2.25 = -7.004462863 Simplifying X + -2.25 = -7.004462863 Reorder the terms: -2.25 + X = -7.004462863 Solving -2.25 + X = -7.004462863 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '2.25' to each side of the equation. -2.25 + 2.25 + X = -7.004462863 + 2.25 Combine like terms: -2.25 + 2.25 = 0.00 0.00 + X = -7.004462863 + 2.25 X = -7.004462863 + 2.25 Combine like terms: -7.004462863 + 2.25 = -4.754462863 X = -4.754462863 Simplifying X = -4.754462863

Solution

The solution to the problem is based on the solutions from the subproblems. X = {9.254462863, -4.754462863}

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