3x+121=x^2+10x+25

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Solution for 3x+121=x^2+10x+25 equation:


Simplifying
3x + 121 = x2 + 10x + 25

Reorder the terms:
121 + 3x = x2 + 10x + 25

Reorder the terms:
121 + 3x = 25 + 10x + x2

Solving
121 + 3x = 25 + 10x + x2

Solving for variable 'x'.

Reorder the terms:
121 + -25 + 3x + -10x + -1x2 = 25 + 10x + x2 + -25 + -10x + -1x2

Combine like terms: 121 + -25 = 96
96 + 3x + -10x + -1x2 = 25 + 10x + x2 + -25 + -10x + -1x2

Combine like terms: 3x + -10x = -7x
96 + -7x + -1x2 = 25 + 10x + x2 + -25 + -10x + -1x2

Reorder the terms:
96 + -7x + -1x2 = 25 + -25 + 10x + -10x + x2 + -1x2

Combine like terms: 25 + -25 = 0
96 + -7x + -1x2 = 0 + 10x + -10x + x2 + -1x2
96 + -7x + -1x2 = 10x + -10x + x2 + -1x2

Combine like terms: 10x + -10x = 0
96 + -7x + -1x2 = 0 + x2 + -1x2
96 + -7x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
96 + -7x + -1x2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-96 + 7x + x2 = 0

Move the constant term to the right:

Add '96' to each side of the equation.
-96 + 7x + 96 + x2 = 0 + 96

Reorder the terms:
-96 + 96 + 7x + x2 = 0 + 96

Combine like terms: -96 + 96 = 0
0 + 7x + x2 = 0 + 96
7x + x2 = 0 + 96

Combine like terms: 0 + 96 = 96
7x + x2 = 96

The x term is 7x.  Take half its coefficient (3.5).
Square it (12.25) and add it to both sides.

Add '12.25' to each side of the equation.
7x + 12.25 + x2 = 96 + 12.25

Reorder the terms:
12.25 + 7x + x2 = 96 + 12.25

Combine like terms: 96 + 12.25 = 108.25
12.25 + 7x + x2 = 108.25

Factor a perfect square on the left side:
(x + 3.5)(x + 3.5) = 108.25

Calculate the square root of the right side: 10.404326023

Break this problem into two subproblems by setting 
(x + 3.5) equal to 10.404326023 and -10.404326023.

Subproblem 1

x + 3.5 = 10.404326023 Simplifying x + 3.5 = 10.404326023 Reorder the terms: 3.5 + x = 10.404326023 Solving 3.5 + x = 10.404326023 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.5' to each side of the equation. 3.5 + -3.5 + x = 10.404326023 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + x = 10.404326023 + -3.5 x = 10.404326023 + -3.5 Combine like terms: 10.404326023 + -3.5 = 6.904326023 x = 6.904326023 Simplifying x = 6.904326023

Subproblem 2

x + 3.5 = -10.404326023 Simplifying x + 3.5 = -10.404326023 Reorder the terms: 3.5 + x = -10.404326023 Solving 3.5 + x = -10.404326023 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.5' to each side of the equation. 3.5 + -3.5 + x = -10.404326023 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + x = -10.404326023 + -3.5 x = -10.404326023 + -3.5 Combine like terms: -10.404326023 + -3.5 = -13.904326023 x = -13.904326023 Simplifying x = -13.904326023

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.904326023, -13.904326023}

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