5x^2+22x=-18

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Solution for 5x^2+22x=-18 equation:


Simplifying
5x2 + 22x = -18

Reorder the terms:
22x + 5x2 = -18

Solving
22x + 5x2 = -18

Solving for variable 'x'.

Reorder the terms:
18 + 22x + 5x2 = -18 + 18

Combine like terms: -18 + 18 = 0
18 + 22x + 5x2 = 0

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

Divide each side by '5'.
3.6 + 4.4x + x2 = 0

Move the constant term to the right:

Add '-3.6' to each side of the equation.
3.6 + 4.4x + -3.6 + x2 = 0 + -3.6

Reorder the terms:
3.6 + -3.6 + 4.4x + x2 = 0 + -3.6

Combine like terms: 3.6 + -3.6 = 0.0
0.0 + 4.4x + x2 = 0 + -3.6
4.4x + x2 = 0 + -3.6

Combine like terms: 0 + -3.6 = -3.6
4.4x + x2 = -3.6

The x term is 4.4x.  Take half its coefficient (2.2).
Square it (4.84) and add it to both sides.

Add '4.84' to each side of the equation.
4.4x + 4.84 + x2 = -3.6 + 4.84

Reorder the terms:
4.84 + 4.4x + x2 = -3.6 + 4.84

Combine like terms: -3.6 + 4.84 = 1.24
4.84 + 4.4x + x2 = 1.24

Factor a perfect square on the left side:
(x + 2.2)(x + 2.2) = 1.24

Calculate the square root of the right side: 1.113552873

Break this problem into two subproblems by setting 
(x + 2.2) equal to 1.113552873 and -1.113552873.

Subproblem 1

x + 2.2 = 1.113552873 Simplifying x + 2.2 = 1.113552873 Reorder the terms: 2.2 + x = 1.113552873 Solving 2.2 + x = 1.113552873 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.2' to each side of the equation. 2.2 + -2.2 + x = 1.113552873 + -2.2 Combine like terms: 2.2 + -2.2 = 0.0 0.0 + x = 1.113552873 + -2.2 x = 1.113552873 + -2.2 Combine like terms: 1.113552873 + -2.2 = -1.086447127 x = -1.086447127 Simplifying x = -1.086447127

Subproblem 2

x + 2.2 = -1.113552873 Simplifying x + 2.2 = -1.113552873 Reorder the terms: 2.2 + x = -1.113552873 Solving 2.2 + x = -1.113552873 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.2' to each side of the equation. 2.2 + -2.2 + x = -1.113552873 + -2.2 Combine like terms: 2.2 + -2.2 = 0.0 0.0 + x = -1.113552873 + -2.2 x = -1.113552873 + -2.2 Combine like terms: -1.113552873 + -2.2 = -3.313552873 x = -3.313552873 Simplifying x = -3.313552873

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-1.086447127, -3.313552873}

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