x^2+18x-61=4

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Solution for x^2+18x-61=4 equation:


Simplifying
x2 + 18x + -61 = 4

Reorder the terms:
-61 + 18x + x2 = 4

Solving
-61 + 18x + x2 = 4

Solving for variable 'x'.

Reorder the terms:
-61 + -4 + 18x + x2 = 4 + -4

Combine like terms: -61 + -4 = -65
-65 + 18x + x2 = 4 + -4

Combine like terms: 4 + -4 = 0
-65 + 18x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '65' to each side of the equation.
-65 + 18x + 65 + x2 = 0 + 65

Reorder the terms:
-65 + 65 + 18x + x2 = 0 + 65

Combine like terms: -65 + 65 = 0
0 + 18x + x2 = 0 + 65
18x + x2 = 0 + 65

Combine like terms: 0 + 65 = 65
18x + x2 = 65

The x term is 18x.  Take half its coefficient (9).
Square it (81) and add it to both sides.

Add '81' to each side of the equation.
18x + 81 + x2 = 65 + 81

Reorder the terms:
81 + 18x + x2 = 65 + 81

Combine like terms: 65 + 81 = 146
81 + 18x + x2 = 146

Factor a perfect square on the left side:
(x + 9)(x + 9) = 146

Calculate the square root of the right side: 12.083045974

Break this problem into two subproblems by setting 
(x + 9) equal to 12.083045974 and -12.083045974.

Subproblem 1

x + 9 = 12.083045974 Simplifying x + 9 = 12.083045974 Reorder the terms: 9 + x = 12.083045974 Solving 9 + x = 12.083045974 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + x = 12.083045974 + -9 Combine like terms: 9 + -9 = 0 0 + x = 12.083045974 + -9 x = 12.083045974 + -9 Combine like terms: 12.083045974 + -9 = 3.083045974 x = 3.083045974 Simplifying x = 3.083045974

Subproblem 2

x + 9 = -12.083045974 Simplifying x + 9 = -12.083045974 Reorder the terms: 9 + x = -12.083045974 Solving 9 + x = -12.083045974 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + x = -12.083045974 + -9 Combine like terms: 9 + -9 = 0 0 + x = -12.083045974 + -9 x = -12.083045974 + -9 Combine like terms: -12.083045974 + -9 = -21.083045974 x = -21.083045974 Simplifying x = -21.083045974

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.083045974, -21.083045974}

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