-9-3x+2x^2=9

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Solution for -9-3x+2x^2=9 equation:


Simplifying
-9 + -3x + 2x2 = 9

Solving
-9 + -3x + 2x2 = 9

Solving for variable 'x'.

Reorder the terms:
-9 + -9 + -3x + 2x2 = 9 + -9

Combine like terms: -9 + -9 = -18
-18 + -3x + 2x2 = 9 + -9

Combine like terms: 9 + -9 = 0
-18 + -3x + 2x2 = 0

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

Divide each side by '2'.
-9 + -1.5x + x2 = 0

Move the constant term to the right:

Add '9' to each side of the equation.
-9 + -1.5x + 9 + x2 = 0 + 9

Reorder the terms:
-9 + 9 + -1.5x + x2 = 0 + 9

Combine like terms: -9 + 9 = 0
0 + -1.5x + x2 = 0 + 9
-1.5x + x2 = 0 + 9

Combine like terms: 0 + 9 = 9
-1.5x + x2 = 9

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 = 9 + 0.5625

Reorder the terms:
0.5625 + -1.5x + x2 = 9 + 0.5625

Combine like terms: 9 + 0.5625 = 9.5625
0.5625 + -1.5x + x2 = 9.5625

Factor a perfect square on the left side:
(x + -0.75)(x + -0.75) = 9.5625

Calculate the square root of the right side: 3.092329219

Break this problem into two subproblems by setting 
(x + -0.75) equal to 3.092329219 and -3.092329219.

Subproblem 1

x + -0.75 = 3.092329219 Simplifying x + -0.75 = 3.092329219 Reorder the terms: -0.75 + x = 3.092329219 Solving -0.75 + x = 3.092329219 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 = 3.092329219 + 0.75 Combine like terms: -0.75 + 0.75 = 0.00 0.00 + x = 3.092329219 + 0.75 x = 3.092329219 + 0.75 Combine like terms: 3.092329219 + 0.75 = 3.842329219 x = 3.842329219 Simplifying x = 3.842329219

Subproblem 2

x + -0.75 = -3.092329219 Simplifying x + -0.75 = -3.092329219 Reorder the terms: -0.75 + x = -3.092329219 Solving -0.75 + x = -3.092329219 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 = -3.092329219 + 0.75 Combine like terms: -0.75 + 0.75 = 0.00 0.00 + x = -3.092329219 + 0.75 x = -3.092329219 + 0.75 Combine like terms: -3.092329219 + 0.75 = -2.342329219 x = -2.342329219 Simplifying x = -2.342329219

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.842329219, -2.342329219}

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