5x(x+1.1)=18.5

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Solution for 5x(x+1.1)=18.5 equation:


Simplifying
5x(x + 1.1) = 18.5

Reorder the terms:
5x(1.1 + x) = 18.5
(1.1 * 5x + x * 5x) = 18.5
(5.5x + 5x2) = 18.5

Solving
5.5x + 5x2 = 18.5

Solving for variable 'x'.

Reorder the terms:
-18.5 + 5.5x + 5x2 = 18.5 + -18.5

Combine like terms: 18.5 + -18.5 = 0.0
-18.5 + 5.5x + 5x2 = 0.0

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

Divide each side by '5'.
-3.7 + 1.1x + x2 = 0.0

Move the constant term to the right:

Add '3.7' to each side of the equation.
-3.7 + 1.1x + 3.7 + x2 = 0.0 + 3.7

Reorder the terms:
-3.7 + 3.7 + 1.1x + x2 = 0.0 + 3.7

Combine like terms: -3.7 + 3.7 = 0.0
0.0 + 1.1x + x2 = 0.0 + 3.7
1.1x + x2 = 0.0 + 3.7

Combine like terms: 0.0 + 3.7 = 3.7
1.1x + x2 = 3.7

The x term is 1.1x.  Take half its coefficient (0.55).
Square it (0.3025) and add it to both sides.

Add '0.3025' to each side of the equation.
1.1x + 0.3025 + x2 = 3.7 + 0.3025

Reorder the terms:
0.3025 + 1.1x + x2 = 3.7 + 0.3025

Combine like terms: 3.7 + 0.3025 = 4.0025
0.3025 + 1.1x + x2 = 4.0025

Factor a perfect square on the left side:
(x + 0.55)(x + 0.55) = 4.0025

Calculate the square root of the right side: 2.000624902

Break this problem into two subproblems by setting 
(x + 0.55) equal to 2.000624902 and -2.000624902.

Subproblem 1

x + 0.55 = 2.000624902 Simplifying x + 0.55 = 2.000624902 Reorder the terms: 0.55 + x = 2.000624902 Solving 0.55 + x = 2.000624902 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.55' to each side of the equation. 0.55 + -0.55 + x = 2.000624902 + -0.55 Combine like terms: 0.55 + -0.55 = 0.00 0.00 + x = 2.000624902 + -0.55 x = 2.000624902 + -0.55 Combine like terms: 2.000624902 + -0.55 = 1.450624902 x = 1.450624902 Simplifying x = 1.450624902

Subproblem 2

x + 0.55 = -2.000624902 Simplifying x + 0.55 = -2.000624902 Reorder the terms: 0.55 + x = -2.000624902 Solving 0.55 + x = -2.000624902 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.55' to each side of the equation. 0.55 + -0.55 + x = -2.000624902 + -0.55 Combine like terms: 0.55 + -0.55 = 0.00 0.00 + x = -2.000624902 + -0.55 x = -2.000624902 + -0.55 Combine like terms: -2.000624902 + -0.55 = -2.550624902 x = -2.550624902 Simplifying x = -2.550624902

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.450624902, -2.550624902}

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