x^2+2x=54

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Solution for x^2+2x=54 equation:


Simplifying
x2 + 2x = 54

Reorder the terms:
2x + x2 = 54

Solving
2x + x2 = 54

Solving for variable 'x'.

Reorder the terms:
-54 + 2x + x2 = 54 + -54

Combine like terms: 54 + -54 = 0
-54 + 2x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '54' to each side of the equation.
-54 + 2x + 54 + x2 = 0 + 54

Reorder the terms:
-54 + 54 + 2x + x2 = 0 + 54

Combine like terms: -54 + 54 = 0
0 + 2x + x2 = 0 + 54
2x + x2 = 0 + 54

Combine like terms: 0 + 54 = 54
2x + x2 = 54

The x term is 2x.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2x + 1 + x2 = 54 + 1

Reorder the terms:
1 + 2x + x2 = 54 + 1

Combine like terms: 54 + 1 = 55
1 + 2x + x2 = 55

Factor a perfect square on the left side:
(x + 1)(x + 1) = 55

Calculate the square root of the right side: 7.416198487

Break this problem into two subproblems by setting 
(x + 1) equal to 7.416198487 and -7.416198487.

Subproblem 1

x + 1 = 7.416198487 Simplifying x + 1 = 7.416198487 Reorder the terms: 1 + x = 7.416198487 Solving 1 + x = 7.416198487 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = 7.416198487 + -1 Combine like terms: 1 + -1 = 0 0 + x = 7.416198487 + -1 x = 7.416198487 + -1 Combine like terms: 7.416198487 + -1 = 6.416198487 x = 6.416198487 Simplifying x = 6.416198487

Subproblem 2

x + 1 = -7.416198487 Simplifying x + 1 = -7.416198487 Reorder the terms: 1 + x = -7.416198487 Solving 1 + x = -7.416198487 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = -7.416198487 + -1 Combine like terms: 1 + -1 = 0 0 + x = -7.416198487 + -1 x = -7.416198487 + -1 Combine like terms: -7.416198487 + -1 = -8.416198487 x = -8.416198487 Simplifying x = -8.416198487

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.416198487, -8.416198487}

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