3x^2+3x-18=-4

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Solution for 3x^2+3x-18=-4 equation:


Simplifying
3x2 + 3x + -18 = -4

Reorder the terms:
-18 + 3x + 3x2 = -4

Solving
-18 + 3x + 3x2 = -4

Solving for variable 'x'.

Reorder the terms:
-18 + 4 + 3x + 3x2 = -4 + 4

Combine like terms: -18 + 4 = -14
-14 + 3x + 3x2 = -4 + 4

Combine like terms: -4 + 4 = 0
-14 + 3x + 3x2 = 0

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

Divide each side by '3'.
-4.666666667 + x + x2 = 0

Move the constant term to the right:

Add '4.666666667' to each side of the equation.
-4.666666667 + x + 4.666666667 + x2 = 0 + 4.666666667

Reorder the terms:
-4.666666667 + 4.666666667 + x + x2 = 0 + 4.666666667

Combine like terms: -4.666666667 + 4.666666667 = 0.000000000
0.000000000 + x + x2 = 0 + 4.666666667
x + x2 = 0 + 4.666666667

Combine like terms: 0 + 4.666666667 = 4.666666667
x + x2 = 4.666666667

The x term is x.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
 + 0.25 + x2 = 4.666666667 + 0.25

Combine like terms:  + 0.25 = 1.25
1.25 + x2 = 4.666666667 + 0.25

Combine like terms: 4.666666667 + 0.25 = 4.916666667
1.25 + x2 = 4.916666667

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 4.916666667

Calculate the square root of the right side: 2.217355783

Break this problem into two subproblems by setting 
(x + 0.5) equal to 2.217355783 and -2.217355783.

Subproblem 1

x + 0.5 = 2.217355783 Simplifying x + 0.5 = 2.217355783 Reorder the terms: 0.5 + x = 2.217355783 Solving 0.5 + x = 2.217355783 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = 2.217355783 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 2.217355783 + -0.5 x = 2.217355783 + -0.5 Combine like terms: 2.217355783 + -0.5 = 1.717355783 x = 1.717355783 Simplifying x = 1.717355783

Subproblem 2

x + 0.5 = -2.217355783 Simplifying x + 0.5 = -2.217355783 Reorder the terms: 0.5 + x = -2.217355783 Solving 0.5 + x = -2.217355783 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = -2.217355783 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -2.217355783 + -0.5 x = -2.217355783 + -0.5 Combine like terms: -2.217355783 + -0.5 = -2.717355783 x = -2.717355783 Simplifying x = -2.717355783

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.717355783, -2.717355783}

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