2x^2+12x+24=213

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Solution for 2x^2+12x+24=213 equation:


Simplifying
2x2 + 12x + 24 = 213

Reorder the terms:
24 + 12x + 2x2 = 213

Solving
24 + 12x + 2x2 = 213

Solving for variable 'x'.

Reorder the terms:
24 + -213 + 12x + 2x2 = 213 + -213

Combine like terms: 24 + -213 = -189
-189 + 12x + 2x2 = 213 + -213

Combine like terms: 213 + -213 = 0
-189 + 12x + 2x2 = 0

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

Divide each side by '2'.
-94.5 + 6x + x2 = 0

Move the constant term to the right:

Add '94.5' to each side of the equation.
-94.5 + 6x + 94.5 + x2 = 0 + 94.5

Reorder the terms:
-94.5 + 94.5 + 6x + x2 = 0 + 94.5

Combine like terms: -94.5 + 94.5 = 0.0
0.0 + 6x + x2 = 0 + 94.5
6x + x2 = 0 + 94.5

Combine like terms: 0 + 94.5 = 94.5
6x + x2 = 94.5

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 = 94.5 + 9

Reorder the terms:
9 + 6x + x2 = 94.5 + 9

Combine like terms: 94.5 + 9 = 103.5
9 + 6x + x2 = 103.5

Factor a perfect square on the left side:
(x + 3)(x + 3) = 103.5

Calculate the square root of the right side: 10.173494975

Break this problem into two subproblems by setting 
(x + 3) equal to 10.173494975 and -10.173494975.

Subproblem 1

x + 3 = 10.173494975 Simplifying x + 3 = 10.173494975 Reorder the terms: 3 + x = 10.173494975 Solving 3 + x = 10.173494975 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 = 10.173494975 + -3 Combine like terms: 3 + -3 = 0 0 + x = 10.173494975 + -3 x = 10.173494975 + -3 Combine like terms: 10.173494975 + -3 = 7.173494975 x = 7.173494975 Simplifying x = 7.173494975

Subproblem 2

x + 3 = -10.173494975 Simplifying x + 3 = -10.173494975 Reorder the terms: 3 + x = -10.173494975 Solving 3 + x = -10.173494975 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 = -10.173494975 + -3 Combine like terms: 3 + -3 = 0 0 + x = -10.173494975 + -3 x = -10.173494975 + -3 Combine like terms: -10.173494975 + -3 = -13.173494975 x = -13.173494975 Simplifying x = -13.173494975

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.173494975, -13.173494975}

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