4.5x^2+8.8x-18=0

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Solution for 4.5x^2+8.8x-18=0 equation:


Simplifying
4.5x2 + 8.8x + -18 = 0

Reorder the terms:
-18 + 8.8x + 4.5x2 = 0

Solving
-18 + 8.8x + 4.5x2 = 0

Solving for variable 'x'.

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

Divide each side by '4.5'.
-4 + 1.955555556x + x2 = 0

Move the constant term to the right:

Add '4' to each side of the equation.
-4 + 1.955555556x + 4 + x2 = 0 + 4

Reorder the terms:
-4 + 4 + 1.955555556x + x2 = 0 + 4

Combine like terms: -4 + 4 = 0
0 + 1.955555556x + x2 = 0 + 4
1.955555556x + x2 = 0 + 4

Combine like terms: 0 + 4 = 4
1.955555556x + x2 = 4

The x term is 1.955555556x.  Take half its coefficient (0.977777778).
Square it (0.9560493832) and add it to both sides.

Add '0.9560493832' to each side of the equation.
1.955555556x + 0.9560493832 + x2 = 4 + 0.9560493832

Reorder the terms:
0.9560493832 + 1.955555556x + x2 = 4 + 0.9560493832

Combine like terms: 4 + 0.9560493832 = 4.9560493832
0.9560493832 + 1.955555556x + x2 = 4.9560493832

Factor a perfect square on the left side:
(x + 0.977777778)(x + 0.977777778) = 4.9560493832

Calculate the square root of the right side: 2.226218629

Break this problem into two subproblems by setting 
(x + 0.977777778) equal to 2.226218629 and -2.226218629.

Subproblem 1

x + 0.977777778 = 2.226218629 Simplifying x + 0.977777778 = 2.226218629 Reorder the terms: 0.977777778 + x = 2.226218629 Solving 0.977777778 + x = 2.226218629 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.977777778' to each side of the equation. 0.977777778 + -0.977777778 + x = 2.226218629 + -0.977777778 Combine like terms: 0.977777778 + -0.977777778 = 0.000000000 0.000000000 + x = 2.226218629 + -0.977777778 x = 2.226218629 + -0.977777778 Combine like terms: 2.226218629 + -0.977777778 = 1.248440851 x = 1.248440851 Simplifying x = 1.248440851

Subproblem 2

x + 0.977777778 = -2.226218629 Simplifying x + 0.977777778 = -2.226218629 Reorder the terms: 0.977777778 + x = -2.226218629 Solving 0.977777778 + x = -2.226218629 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.977777778' to each side of the equation. 0.977777778 + -0.977777778 + x = -2.226218629 + -0.977777778 Combine like terms: 0.977777778 + -0.977777778 = 0.000000000 0.000000000 + x = -2.226218629 + -0.977777778 x = -2.226218629 + -0.977777778 Combine like terms: -2.226218629 + -0.977777778 = -3.203996407 x = -3.203996407 Simplifying x = -3.203996407

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.248440851, -3.203996407}

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