2x^2-9x=222

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Solution for 2x^2-9x=222 equation:


Simplifying
2x2 + -9x = 222

Reorder the terms:
-9x + 2x2 = 222

Solving
-9x + 2x2 = 222

Solving for variable 'x'.

Reorder the terms:
-222 + -9x + 2x2 = 222 + -222

Combine like terms: 222 + -222 = 0
-222 + -9x + 2x2 = 0

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

Divide each side by '2'.
-111 + -4.5x + x2 = 0

Move the constant term to the right:

Add '111' to each side of the equation.
-111 + -4.5x + 111 + x2 = 0 + 111

Reorder the terms:
-111 + 111 + -4.5x + x2 = 0 + 111

Combine like terms: -111 + 111 = 0
0 + -4.5x + x2 = 0 + 111
-4.5x + x2 = 0 + 111

Combine like terms: 0 + 111 = 111
-4.5x + x2 = 111

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 = 111 + 5.0625

Reorder the terms:
5.0625 + -4.5x + x2 = 111 + 5.0625

Combine like terms: 111 + 5.0625 = 116.0625
5.0625 + -4.5x + x2 = 116.0625

Factor a perfect square on the left side:
(x + -2.25)(x + -2.25) = 116.0625

Calculate the square root of the right side: 10.773230713

Break this problem into two subproblems by setting 
(x + -2.25) equal to 10.773230713 and -10.773230713.

Subproblem 1

x + -2.25 = 10.773230713 Simplifying x + -2.25 = 10.773230713 Reorder the terms: -2.25 + x = 10.773230713 Solving -2.25 + x = 10.773230713 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 = 10.773230713 + 2.25 Combine like terms: -2.25 + 2.25 = 0.00 0.00 + x = 10.773230713 + 2.25 x = 10.773230713 + 2.25 Combine like terms: 10.773230713 + 2.25 = 13.023230713 x = 13.023230713 Simplifying x = 13.023230713

Subproblem 2

x + -2.25 = -10.773230713 Simplifying x + -2.25 = -10.773230713 Reorder the terms: -2.25 + x = -10.773230713 Solving -2.25 + x = -10.773230713 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 = -10.773230713 + 2.25 Combine like terms: -2.25 + 2.25 = 0.00 0.00 + x = -10.773230713 + 2.25 x = -10.773230713 + 2.25 Combine like terms: -10.773230713 + 2.25 = -8.523230713 x = -8.523230713 Simplifying x = -8.523230713

Solution

The solution to the problem is based on the solutions from the subproblems. x = {13.023230713, -8.523230713}

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