2x^2+20x+12=5

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Solution for 2x^2+20x+12=5 equation:


Simplifying
2x2 + 20x + 12 = 5

Reorder the terms:
12 + 20x + 2x2 = 5

Solving
12 + 20x + 2x2 = 5

Solving for variable 'x'.

Reorder the terms:
12 + -5 + 20x + 2x2 = 5 + -5

Combine like terms: 12 + -5 = 7
7 + 20x + 2x2 = 5 + -5

Combine like terms: 5 + -5 = 0
7 + 20x + 2x2 = 0

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

Divide each side by '2'.
3.5 + 10x + x2 = 0

Move the constant term to the right:

Add '-3.5' to each side of the equation.
3.5 + 10x + -3.5 + x2 = 0 + -3.5

Reorder the terms:
3.5 + -3.5 + 10x + x2 = 0 + -3.5

Combine like terms: 3.5 + -3.5 = 0.0
0.0 + 10x + x2 = 0 + -3.5
10x + x2 = 0 + -3.5

Combine like terms: 0 + -3.5 = -3.5
10x + x2 = -3.5

The x term is 10x.  Take half its coefficient (5).
Square it (25) and add it to both sides.

Add '25' to each side of the equation.
10x + 25 + x2 = -3.5 + 25

Reorder the terms:
25 + 10x + x2 = -3.5 + 25

Combine like terms: -3.5 + 25 = 21.5
25 + 10x + x2 = 21.5

Factor a perfect square on the left side:
(x + 5)(x + 5) = 21.5

Calculate the square root of the right side: 4.636809248

Break this problem into two subproblems by setting 
(x + 5) equal to 4.636809248 and -4.636809248.

Subproblem 1

x + 5 = 4.636809248 Simplifying x + 5 = 4.636809248 Reorder the terms: 5 + x = 4.636809248 Solving 5 + x = 4.636809248 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + x = 4.636809248 + -5 Combine like terms: 5 + -5 = 0 0 + x = 4.636809248 + -5 x = 4.636809248 + -5 Combine like terms: 4.636809248 + -5 = -0.363190752 x = -0.363190752 Simplifying x = -0.363190752

Subproblem 2

x + 5 = -4.636809248 Simplifying x + 5 = -4.636809248 Reorder the terms: 5 + x = -4.636809248 Solving 5 + x = -4.636809248 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + x = -4.636809248 + -5 Combine like terms: 5 + -5 = 0 0 + x = -4.636809248 + -5 x = -4.636809248 + -5 Combine like terms: -4.636809248 + -5 = -9.636809248 x = -9.636809248 Simplifying x = -9.636809248

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.363190752, -9.636809248}

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