12x+7=5-2x^2

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Solution for 12x+7=5-2x^2 equation:


Simplifying
12x + 7 = 5 + -2x2

Reorder the terms:
7 + 12x = 5 + -2x2

Solving
7 + 12x = 5 + -2x2

Solving for variable 'x'.

Reorder the terms:
7 + -5 + 12x + 2x2 = 5 + -2x2 + -5 + 2x2

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

Reorder the terms:
2 + 12x + 2x2 = 5 + -5 + -2x2 + 2x2

Combine like terms: 5 + -5 = 0
2 + 12x + 2x2 = 0 + -2x2 + 2x2
2 + 12x + 2x2 = -2x2 + 2x2

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

Factor out the Greatest Common Factor (GCF), '2'.
2(1 + 6x + x2) = 0

Ignore the factor 2.

Subproblem 1

Set the factor '(1 + 6x + x2)' equal to zero and attempt to solve: Simplifying 1 + 6x + x2 = 0 Solving 1 + 6x + x2 = 0 Begin completing the square. Move the constant term to the right: Add '-1' to each side of the equation. 1 + 6x + -1 + x2 = 0 + -1 Reorder the terms: 1 + -1 + 6x + x2 = 0 + -1 Combine like terms: 1 + -1 = 0 0 + 6x + x2 = 0 + -1 6x + x2 = 0 + -1 Combine like terms: 0 + -1 = -1 6x + x2 = -1 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 = -1 + 9 Reorder the terms: 9 + 6x + x2 = -1 + 9 Combine like terms: -1 + 9 = 8 9 + 6x + x2 = 8 Factor a perfect square on the left side: (x + 3)(x + 3) = 8 Calculate the square root of the right side: 2.828427125 Break this problem into two subproblems by setting (x + 3) equal to 2.828427125 and -2.828427125.

Subproblem 1

x + 3 = 2.828427125 Simplifying x + 3 = 2.828427125 Reorder the terms: 3 + x = 2.828427125 Solving 3 + x = 2.828427125 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 = 2.828427125 + -3 Combine like terms: 3 + -3 = 0 0 + x = 2.828427125 + -3 x = 2.828427125 + -3 Combine like terms: 2.828427125 + -3 = -0.171572875 x = -0.171572875 Simplifying x = -0.171572875

Subproblem 2

x + 3 = -2.828427125 Simplifying x + 3 = -2.828427125 Reorder the terms: 3 + x = -2.828427125 Solving 3 + x = -2.828427125 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 = -2.828427125 + -3 Combine like terms: 3 + -3 = 0 0 + x = -2.828427125 + -3 x = -2.828427125 + -3 Combine like terms: -2.828427125 + -3 = -5.828427125 x = -5.828427125 Simplifying x = -5.828427125

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.171572875, -5.828427125}

Solution

x = {-0.171572875, -5.828427125}

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