x^2+20x+100=7

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Solution for x^2+20x+100=7 equation:


Simplifying
x2 + 20x + 100 = 7

Reorder the terms:
100 + 20x + x2 = 7

Solving
100 + 20x + x2 = 7

Solving for variable 'x'.

Reorder the terms:
100 + -7 + 20x + x2 = 7 + -7

Combine like terms: 100 + -7 = 93
93 + 20x + x2 = 7 + -7

Combine like terms: 7 + -7 = 0
93 + 20x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-93' to each side of the equation.
93 + 20x + -93 + x2 = 0 + -93

Reorder the terms:
93 + -93 + 20x + x2 = 0 + -93

Combine like terms: 93 + -93 = 0
0 + 20x + x2 = 0 + -93
20x + x2 = 0 + -93

Combine like terms: 0 + -93 = -93
20x + x2 = -93

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 = -93 + 100

Reorder the terms:
100 + 20x + x2 = -93 + 100

Combine like terms: -93 + 100 = 7
100 + 20x + x2 = 7

Factor a perfect square on the left side:
(x + 10)(x + 10) = 7

Calculate the square root of the right side: 2.645751311

Break this problem into two subproblems by setting 
(x + 10) equal to 2.645751311 and -2.645751311.

Subproblem 1

x + 10 = 2.645751311 Simplifying x + 10 = 2.645751311 Reorder the terms: 10 + x = 2.645751311 Solving 10 + x = 2.645751311 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 = 2.645751311 + -10 Combine like terms: 10 + -10 = 0 0 + x = 2.645751311 + -10 x = 2.645751311 + -10 Combine like terms: 2.645751311 + -10 = -7.354248689 x = -7.354248689 Simplifying x = -7.354248689

Subproblem 2

x + 10 = -2.645751311 Simplifying x + 10 = -2.645751311 Reorder the terms: 10 + x = -2.645751311 Solving 10 + x = -2.645751311 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 = -2.645751311 + -10 Combine like terms: 10 + -10 = 0 0 + x = -2.645751311 + -10 x = -2.645751311 + -10 Combine like terms: -2.645751311 + -10 = -12.645751311 x = -12.645751311 Simplifying x = -12.645751311

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-7.354248689, -12.645751311}

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