18x+8=3x^2-0.75

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Solution for 18x+8=3x^2-0.75 equation:


Simplifying
18x + 8 = 3x2 + -0.75

Reorder the terms:
8 + 18x = 3x2 + -0.75

Reorder the terms:
8 + 18x = -0.75 + 3x2

Solving
8 + 18x = -0.75 + 3x2

Solving for variable 'x'.

Reorder the terms:
8 + 0.75 + 18x + -3x2 = -0.75 + 3x2 + 0.75 + -3x2

Combine like terms: 8 + 0.75 = 8.75
8.75 + 18x + -3x2 = -0.75 + 3x2 + 0.75 + -3x2

Reorder the terms:
8.75 + 18x + -3x2 = -0.75 + 0.75 + 3x2 + -3x2

Combine like terms: -0.75 + 0.75 = 0.00
8.75 + 18x + -3x2 = 0.00 + 3x2 + -3x2
8.75 + 18x + -3x2 = 3x2 + -3x2

Combine like terms: 3x2 + -3x2 = 0
8.75 + 18x + -3x2 = 0

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

Divide each side by '-3'.
-2.916666667 + -6x + x2 = 0

Move the constant term to the right:

Add '2.916666667' to each side of the equation.
-2.916666667 + -6x + 2.916666667 + x2 = 0 + 2.916666667

Reorder the terms:
-2.916666667 + 2.916666667 + -6x + x2 = 0 + 2.916666667

Combine like terms: -2.916666667 + 2.916666667 = 0.000000000
0.000000000 + -6x + x2 = 0 + 2.916666667
-6x + x2 = 0 + 2.916666667

Combine like terms: 0 + 2.916666667 = 2.916666667
-6x + x2 = 2.916666667

The x term is -6x.  Take half its coefficient (-3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
-6x + 9 + x2 = 2.916666667 + 9

Reorder the terms:
9 + -6x + x2 = 2.916666667 + 9

Combine like terms: 2.916666667 + 9 = 11.916666667
9 + -6x + x2 = 11.916666667

Factor a perfect square on the left side:
(x + -3)(x + -3) = 11.916666667

Calculate the square root of the right side: 3.45205253

Break this problem into two subproblems by setting 
(x + -3) equal to 3.45205253 and -3.45205253.

Subproblem 1

x + -3 = 3.45205253 Simplifying x + -3 = 3.45205253 Reorder the terms: -3 + x = 3.45205253 Solving -3 + x = 3.45205253 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + x = 3.45205253 + 3 Combine like terms: -3 + 3 = 0 0 + x = 3.45205253 + 3 x = 3.45205253 + 3 Combine like terms: 3.45205253 + 3 = 6.45205253 x = 6.45205253 Simplifying x = 6.45205253

Subproblem 2

x + -3 = -3.45205253 Simplifying x + -3 = -3.45205253 Reorder the terms: -3 + x = -3.45205253 Solving -3 + x = -3.45205253 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + x = -3.45205253 + 3 Combine like terms: -3 + 3 = 0 0 + x = -3.45205253 + 3 x = -3.45205253 + 3 Combine like terms: -3.45205253 + 3 = -0.45205253 x = -0.45205253 Simplifying x = -0.45205253

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.45205253, -0.45205253}

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