x^2+10x+25=15

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Solution for x^2+10x+25=15 equation:


Simplifying
x2 + 10x + 25 = 15

Reorder the terms:
25 + 10x + x2 = 15

Solving
25 + 10x + x2 = 15

Solving for variable 'x'.

Reorder the terms:
25 + -15 + 10x + x2 = 15 + -15

Combine like terms: 25 + -15 = 10
10 + 10x + x2 = 15 + -15

Combine like terms: 15 + -15 = 0
10 + 10x + x2 = 0

Begin completing the square.

Move the constant term to the right:

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

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

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

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

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 = -10 + 25

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

Combine like terms: -10 + 25 = 15
25 + 10x + x2 = 15

Factor a perfect square on the left side:
(x + 5)(x + 5) = 15

Calculate the square root of the right side: 3.872983346

Break this problem into two subproblems by setting 
(x + 5) equal to 3.872983346 and -3.872983346.

Subproblem 1

x + 5 = 3.872983346 Simplifying x + 5 = 3.872983346 Reorder the terms: 5 + x = 3.872983346 Solving 5 + x = 3.872983346 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 = 3.872983346 + -5 Combine like terms: 5 + -5 = 0 0 + x = 3.872983346 + -5 x = 3.872983346 + -5 Combine like terms: 3.872983346 + -5 = -1.127016654 x = -1.127016654 Simplifying x = -1.127016654

Subproblem 2

x + 5 = -3.872983346 Simplifying x + 5 = -3.872983346 Reorder the terms: 5 + x = -3.872983346 Solving 5 + x = -3.872983346 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 = -3.872983346 + -5 Combine like terms: 5 + -5 = 0 0 + x = -3.872983346 + -5 x = -3.872983346 + -5 Combine like terms: -3.872983346 + -5 = -8.872983346 x = -8.872983346 Simplifying x = -8.872983346

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-1.127016654, -8.872983346}

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