x^2+10x+7=12

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Solution for x^2+10x+7=12 equation:


Simplifying
x2 + 10x + 7 = 12

Reorder the terms:
7 + 10x + x2 = 12

Solving
7 + 10x + x2 = 12

Solving for variable 'x'.

Reorder the terms:
7 + -12 + 10x + x2 = 12 + -12

Combine like terms: 7 + -12 = -5
-5 + 10x + x2 = 12 + -12

Combine like terms: 12 + -12 = 0
-5 + 10x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '5' to each side of the equation.
-5 + 10x + 5 + x2 = 0 + 5

Reorder the terms:
-5 + 5 + 10x + x2 = 0 + 5

Combine like terms: -5 + 5 = 0
0 + 10x + x2 = 0 + 5
10x + x2 = 0 + 5

Combine like terms: 0 + 5 = 5
10x + x2 = 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 = 5 + 25

Reorder the terms:
25 + 10x + x2 = 5 + 25

Combine like terms: 5 + 25 = 30
25 + 10x + x2 = 30

Factor a perfect square on the left side:
(x + 5)(x + 5) = 30

Calculate the square root of the right side: 5.477225575

Break this problem into two subproblems by setting 
(x + 5) equal to 5.477225575 and -5.477225575.

Subproblem 1

x + 5 = 5.477225575 Simplifying x + 5 = 5.477225575 Reorder the terms: 5 + x = 5.477225575 Solving 5 + x = 5.477225575 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 = 5.477225575 + -5 Combine like terms: 5 + -5 = 0 0 + x = 5.477225575 + -5 x = 5.477225575 + -5 Combine like terms: 5.477225575 + -5 = 0.477225575 x = 0.477225575 Simplifying x = 0.477225575

Subproblem 2

x + 5 = -5.477225575 Simplifying x + 5 = -5.477225575 Reorder the terms: 5 + x = -5.477225575 Solving 5 + x = -5.477225575 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 = -5.477225575 + -5 Combine like terms: 5 + -5 = 0 0 + x = -5.477225575 + -5 x = -5.477225575 + -5 Combine like terms: -5.477225575 + -5 = -10.477225575 x = -10.477225575 Simplifying x = -10.477225575

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.477225575, -10.477225575}

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