-6x^2+18=7+2x

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Solution for -6x^2+18=7+2x equation:


Simplifying
-6x2 + 18 = 7 + 2x

Reorder the terms:
18 + -6x2 = 7 + 2x

Solving
18 + -6x2 = 7 + 2x

Solving for variable 'x'.

Reorder the terms:
18 + -7 + -2x + -6x2 = 7 + 2x + -7 + -2x

Combine like terms: 18 + -7 = 11
11 + -2x + -6x2 = 7 + 2x + -7 + -2x

Reorder the terms:
11 + -2x + -6x2 = 7 + -7 + 2x + -2x

Combine like terms: 7 + -7 = 0
11 + -2x + -6x2 = 0 + 2x + -2x
11 + -2x + -6x2 = 2x + -2x

Combine like terms: 2x + -2x = 0
11 + -2x + -6x2 = 0

Begin completing the square.  Divide all terms by
-6 the coefficient of the squared term: 

Divide each side by '-6'.
-1.833333333 + 0.3333333333x + x2 = 0

Move the constant term to the right:

Add '1.833333333' to each side of the equation.
-1.833333333 + 0.3333333333x + 1.833333333 + x2 = 0 + 1.833333333

Reorder the terms:
-1.833333333 + 1.833333333 + 0.3333333333x + x2 = 0 + 1.833333333

Combine like terms: -1.833333333 + 1.833333333 = 0.000000000
0.000000000 + 0.3333333333x + x2 = 0 + 1.833333333
0.3333333333x + x2 = 0 + 1.833333333

Combine like terms: 0 + 1.833333333 = 1.833333333
0.3333333333x + x2 = 1.833333333

The x term is 0.3333333333x.  Take half its coefficient (0.1666666667).
Square it (0.02777777779) and add it to both sides.

Add '0.02777777779' to each side of the equation.
0.3333333333x + 0.02777777779 + x2 = 1.833333333 + 0.02777777779

Reorder the terms:
0.02777777779 + 0.3333333333x + x2 = 1.833333333 + 0.02777777779

Combine like terms: 1.833333333 + 0.02777777779 = 1.86111111079
0.02777777779 + 0.3333333333x + x2 = 1.86111111079

Factor a perfect square on the left side:
(x + 0.1666666667)(x + 0.1666666667) = 1.86111111079

Calculate the square root of the right side: 1.364225462

Break this problem into two subproblems by setting 
(x + 0.1666666667) equal to 1.364225462 and -1.364225462.

Subproblem 1

x + 0.1666666667 = 1.364225462 Simplifying x + 0.1666666667 = 1.364225462 Reorder the terms: 0.1666666667 + x = 1.364225462 Solving 0.1666666667 + x = 1.364225462 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.1666666667' to each side of the equation. 0.1666666667 + -0.1666666667 + x = 1.364225462 + -0.1666666667 Combine like terms: 0.1666666667 + -0.1666666667 = 0.0000000000 0.0000000000 + x = 1.364225462 + -0.1666666667 x = 1.364225462 + -0.1666666667 Combine like terms: 1.364225462 + -0.1666666667 = 1.1975587953 x = 1.1975587953 Simplifying x = 1.1975587953

Subproblem 2

x + 0.1666666667 = -1.364225462 Simplifying x + 0.1666666667 = -1.364225462 Reorder the terms: 0.1666666667 + x = -1.364225462 Solving 0.1666666667 + x = -1.364225462 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.1666666667' to each side of the equation. 0.1666666667 + -0.1666666667 + x = -1.364225462 + -0.1666666667 Combine like terms: 0.1666666667 + -0.1666666667 = 0.0000000000 0.0000000000 + x = -1.364225462 + -0.1666666667 x = -1.364225462 + -0.1666666667 Combine like terms: -1.364225462 + -0.1666666667 = -1.5308921287 x = -1.5308921287 Simplifying x = -1.5308921287

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.1975587953, -1.5308921287}

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