2x^2+12x=66

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Solution for 2x^2+12x=66 equation:


Simplifying
2x2 + 12x = 66

Reorder the terms:
12x + 2x2 = 66

Solving
12x + 2x2 = 66

Solving for variable 'x'.

Reorder the terms:
-66 + 12x + 2x2 = 66 + -66

Combine like terms: 66 + -66 = 0
-66 + 12x + 2x2 = 0

Factor out the Greatest Common Factor (GCF), '2'.
2(-33 + 6x + x2) = 0

Ignore the factor 2.

Subproblem 1

Set the factor '(-33 + 6x + x2)' equal to zero and attempt to solve: Simplifying -33 + 6x + x2 = 0 Solving -33 + 6x + x2 = 0 Begin completing the square. Move the constant term to the right: Add '33' to each side of the equation. -33 + 6x + 33 + x2 = 0 + 33 Reorder the terms: -33 + 33 + 6x + x2 = 0 + 33 Combine like terms: -33 + 33 = 0 0 + 6x + x2 = 0 + 33 6x + x2 = 0 + 33 Combine like terms: 0 + 33 = 33 6x + x2 = 33 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 = 33 + 9 Reorder the terms: 9 + 6x + x2 = 33 + 9 Combine like terms: 33 + 9 = 42 9 + 6x + x2 = 42 Factor a perfect square on the left side: (x + 3)(x + 3) = 42 Calculate the square root of the right side: 6.480740698 Break this problem into two subproblems by setting (x + 3) equal to 6.480740698 and -6.480740698.

Subproblem 1

x + 3 = 6.480740698 Simplifying x + 3 = 6.480740698 Reorder the terms: 3 + x = 6.480740698 Solving 3 + x = 6.480740698 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 = 6.480740698 + -3 Combine like terms: 3 + -3 = 0 0 + x = 6.480740698 + -3 x = 6.480740698 + -3 Combine like terms: 6.480740698 + -3 = 3.480740698 x = 3.480740698 Simplifying x = 3.480740698

Subproblem 2

x + 3 = -6.480740698 Simplifying x + 3 = -6.480740698 Reorder the terms: 3 + x = -6.480740698 Solving 3 + x = -6.480740698 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 = -6.480740698 + -3 Combine like terms: 3 + -3 = 0 0 + x = -6.480740698 + -3 x = -6.480740698 + -3 Combine like terms: -6.480740698 + -3 = -9.480740698 x = -9.480740698 Simplifying x = -9.480740698

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.480740698, -9.480740698}

Solution

x = {3.480740698, -9.480740698}

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