X^2+20X+100=12

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Solution for X^2+20X+100=12 equation:


Simplifying
X2 + 20X + 100 = 12

Reorder the terms:
100 + 20X + X2 = 12

Solving
100 + 20X + X2 = 12

Solving for variable 'X'.

Reorder the terms:
100 + -12 + 20X + X2 = 12 + -12

Combine like terms: 100 + -12 = 88
88 + 20X + X2 = 12 + -12

Combine like terms: 12 + -12 = 0
88 + 20X + X2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-88' to each side of the equation.
88 + 20X + -88 + X2 = 0 + -88

Reorder the terms:
88 + -88 + 20X + X2 = 0 + -88

Combine like terms: 88 + -88 = 0
0 + 20X + X2 = 0 + -88
20X + X2 = 0 + -88

Combine like terms: 0 + -88 = -88
20X + X2 = -88

The X term is 20X.  Take half its coefficient (10).
Square it (100) and add it to both sides.

Add '100' to each side of the equation.
20X + 100 + X2 = -88 + 100

Reorder the terms:
100 + 20X + X2 = -88 + 100

Combine like terms: -88 + 100 = 12
100 + 20X + X2 = 12

Factor a perfect square on the left side:
(X + 10)(X + 10) = 12

Calculate the square root of the right side: 3.464101615

Break this problem into two subproblems by setting 
(X + 10) equal to 3.464101615 and -3.464101615.

Subproblem 1

X + 10 = 3.464101615 Simplifying X + 10 = 3.464101615 Reorder the terms: 10 + X = 3.464101615 Solving 10 + X = 3.464101615 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-10' to each side of the equation. 10 + -10 + X = 3.464101615 + -10 Combine like terms: 10 + -10 = 0 0 + X = 3.464101615 + -10 X = 3.464101615 + -10 Combine like terms: 3.464101615 + -10 = -6.535898385 X = -6.535898385 Simplifying X = -6.535898385

Subproblem 2

X + 10 = -3.464101615 Simplifying X + 10 = -3.464101615 Reorder the terms: 10 + X = -3.464101615 Solving 10 + X = -3.464101615 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-10' to each side of the equation. 10 + -10 + X = -3.464101615 + -10 Combine like terms: 10 + -10 = 0 0 + X = -3.464101615 + -10 X = -3.464101615 + -10 Combine like terms: -3.464101615 + -10 = -13.464101615 X = -13.464101615 Simplifying X = -13.464101615

Solution

The solution to the problem is based on the solutions from the subproblems. X = {-6.535898385, -13.464101615}

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