0.45(18)+0.05=0.15x(12+x)

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Solution for 0.45(18)+0.05=0.15x(12+x) equation:


Simplifying
0.45(18) + 0.05 = 0.15x(12 + x)

Multiply 0.45 * 18
8.1 + 0.05 = 0.15x(12 + x)

Combine like terms: 8.1 + 0.05 = 8.15
8.15 = 0.15x(12 + x)
8.15 = (12 * 0.15x + x * 0.15x)
8.15 = (1.8x + 0.15x2)

Solving
8.15 = 1.8x + 0.15x2

Solving for variable 'x'.

Reorder the terms:
8.15 + -1.8x + -0.15x2 = 1.8x + -1.8x + 0.15x2 + -0.15x2

Combine like terms: 1.8x + -1.8x = 0.0
8.15 + -1.8x + -0.15x2 = 0.0 + 0.15x2 + -0.15x2
8.15 + -1.8x + -0.15x2 = 0.15x2 + -0.15x2

Combine like terms: 0.15x2 + -0.15x2 = 0.00
8.15 + -1.8x + -0.15x2 = 0.00

Begin completing the square.  Divide all terms by
-0.15 the coefficient of the squared term: 

Divide each side by '-0.15'.
-54.33333333 + 12x + x2 = 0

Move the constant term to the right:

Add '54.33333333' to each side of the equation.
-54.33333333 + 12x + 54.33333333 + x2 = 0 + 54.33333333

Reorder the terms:
-54.33333333 + 54.33333333 + 12x + x2 = 0 + 54.33333333

Combine like terms: -54.33333333 + 54.33333333 = 0.00000000
0.00000000 + 12x + x2 = 0 + 54.33333333
12x + x2 = 0 + 54.33333333

Combine like terms: 0 + 54.33333333 = 54.33333333
12x + x2 = 54.33333333

The x term is 12x.  Take half its coefficient (6).
Square it (36) and add it to both sides.

Add '36' to each side of the equation.
12x + 36 + x2 = 54.33333333 + 36

Reorder the terms:
36 + 12x + x2 = 54.33333333 + 36

Combine like terms: 54.33333333 + 36 = 90.33333333
36 + 12x + x2 = 90.33333333

Factor a perfect square on the left side:
(x + 6)(x + 6) = 90.33333333

Calculate the square root of the right side: 9.504384953

Break this problem into two subproblems by setting 
(x + 6) equal to 9.504384953 and -9.504384953.

Subproblem 1

x + 6 = 9.504384953 Simplifying x + 6 = 9.504384953 Reorder the terms: 6 + x = 9.504384953 Solving 6 + x = 9.504384953 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6' to each side of the equation. 6 + -6 + x = 9.504384953 + -6 Combine like terms: 6 + -6 = 0 0 + x = 9.504384953 + -6 x = 9.504384953 + -6 Combine like terms: 9.504384953 + -6 = 3.504384953 x = 3.504384953 Simplifying x = 3.504384953

Subproblem 2

x + 6 = -9.504384953 Simplifying x + 6 = -9.504384953 Reorder the terms: 6 + x = -9.504384953 Solving 6 + x = -9.504384953 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6' to each side of the equation. 6 + -6 + x = -9.504384953 + -6 Combine like terms: 6 + -6 = 0 0 + x = -9.504384953 + -6 x = -9.504384953 + -6 Combine like terms: -9.504384953 + -6 = -15.504384953 x = -15.504384953 Simplifying x = -15.504384953

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.504384953, -15.504384953}

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