18x^2-12x+2=7

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Solution for 18x^2-12x+2=7 equation:


Simplifying
18x2 + -12x + 2 = 7

Reorder the terms:
2 + -12x + 18x2 = 7

Solving
2 + -12x + 18x2 = 7

Solving for variable 'x'.

Reorder the terms:
2 + -7 + -12x + 18x2 = 7 + -7

Combine like terms: 2 + -7 = -5
-5 + -12x + 18x2 = 7 + -7

Combine like terms: 7 + -7 = 0
-5 + -12x + 18x2 = 0

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

Divide each side by '18'.
-0.2777777778 + -0.6666666667x + x2 = 0

Move the constant term to the right:

Add '0.2777777778' to each side of the equation.
-0.2777777778 + -0.6666666667x + 0.2777777778 + x2 = 0 + 0.2777777778

Reorder the terms:
-0.2777777778 + 0.2777777778 + -0.6666666667x + x2 = 0 + 0.2777777778

Combine like terms: -0.2777777778 + 0.2777777778 = 0.0000000000
0.0000000000 + -0.6666666667x + x2 = 0 + 0.2777777778
-0.6666666667x + x2 = 0 + 0.2777777778

Combine like terms: 0 + 0.2777777778 = 0.2777777778
-0.6666666667x + x2 = 0.2777777778

The x term is -0.6666666667x.  Take half its coefficient (-0.3333333334).
Square it (0.1111111112) and add it to both sides.

Add '0.1111111112' to each side of the equation.
-0.6666666667x + 0.1111111112 + x2 = 0.2777777778 + 0.1111111112

Reorder the terms:
0.1111111112 + -0.6666666667x + x2 = 0.2777777778 + 0.1111111112

Combine like terms: 0.2777777778 + 0.1111111112 = 0.388888889
0.1111111112 + -0.6666666667x + x2 = 0.388888889

Factor a perfect square on the left side:
(x + -0.3333333334)(x + -0.3333333334) = 0.388888889

Calculate the square root of the right side: 0.623609565

Break this problem into two subproblems by setting 
(x + -0.3333333334) equal to 0.623609565 and -0.623609565.

Subproblem 1

x + -0.3333333334 = 0.623609565 Simplifying x + -0.3333333334 = 0.623609565 Reorder the terms: -0.3333333334 + x = 0.623609565 Solving -0.3333333334 + x = 0.623609565 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.3333333334' to each side of the equation. -0.3333333334 + 0.3333333334 + x = 0.623609565 + 0.3333333334 Combine like terms: -0.3333333334 + 0.3333333334 = 0.0000000000 0.0000000000 + x = 0.623609565 + 0.3333333334 x = 0.623609565 + 0.3333333334 Combine like terms: 0.623609565 + 0.3333333334 = 0.9569428984 x = 0.9569428984 Simplifying x = 0.9569428984

Subproblem 2

x + -0.3333333334 = -0.623609565 Simplifying x + -0.3333333334 = -0.623609565 Reorder the terms: -0.3333333334 + x = -0.623609565 Solving -0.3333333334 + x = -0.623609565 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.3333333334' to each side of the equation. -0.3333333334 + 0.3333333334 + x = -0.623609565 + 0.3333333334 Combine like terms: -0.3333333334 + 0.3333333334 = 0.0000000000 0.0000000000 + x = -0.623609565 + 0.3333333334 x = -0.623609565 + 0.3333333334 Combine like terms: -0.623609565 + 0.3333333334 = -0.2902762316 x = -0.2902762316 Simplifying x = -0.2902762316

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.9569428984, -0.2902762316}

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