12.23+0.06x(x+3)=12.98-0.12x

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Solution for 12.23+0.06x(x+3)=12.98-0.12x equation:


Simplifying
12.23 + 0.06x(x + 3) = 12.98 + -0.12x

Reorder the terms:
12.23 + 0.06x(3 + x) = 12.98 + -0.12x
12.23 + (3 * 0.06x + x * 0.06x) = 12.98 + -0.12x
12.23 + (0.18x + 0.06x2) = 12.98 + -0.12x

Solving
12.23 + 0.18x + 0.06x2 = 12.98 + -0.12x

Solving for variable 'x'.

Reorder the terms:
12.23 + -12.98 + 0.18x + 0.12x + 0.06x2 = 12.98 + -0.12x + -12.98 + 0.12x

Combine like terms: 12.23 + -12.98 = -0.75
-0.75 + 0.18x + 0.12x + 0.06x2 = 12.98 + -0.12x + -12.98 + 0.12x

Combine like terms: 0.18x + 0.12x = 0.3x
-0.75 + 0.3x + 0.06x2 = 12.98 + -0.12x + -12.98 + 0.12x

Reorder the terms:
-0.75 + 0.3x + 0.06x2 = 12.98 + -12.98 + -0.12x + 0.12x

Combine like terms: 12.98 + -12.98 = 0.00
-0.75 + 0.3x + 0.06x2 = 0.00 + -0.12x + 0.12x
-0.75 + 0.3x + 0.06x2 = -0.12x + 0.12x

Combine like terms: -0.12x + 0.12x = 0.00
-0.75 + 0.3x + 0.06x2 = 0.00

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

Divide each side by '0.06'.
-12.5 + 5x + x2 = 0

Move the constant term to the right:

Add '12.5' to each side of the equation.
-12.5 + 5x + 12.5 + x2 = 0 + 12.5

Reorder the terms:
-12.5 + 12.5 + 5x + x2 = 0 + 12.5

Combine like terms: -12.5 + 12.5 = 0.0
0.0 + 5x + x2 = 0 + 12.5
5x + x2 = 0 + 12.5

Combine like terms: 0 + 12.5 = 12.5
5x + x2 = 12.5

The x term is 5x.  Take half its coefficient (2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
5x + 6.25 + x2 = 12.5 + 6.25

Reorder the terms:
6.25 + 5x + x2 = 12.5 + 6.25

Combine like terms: 12.5 + 6.25 = 18.75
6.25 + 5x + x2 = 18.75

Factor a perfect square on the left side:
(x + 2.5)(x + 2.5) = 18.75

Calculate the square root of the right side: 4.330127019

Break this problem into two subproblems by setting 
(x + 2.5) equal to 4.330127019 and -4.330127019.

Subproblem 1

x + 2.5 = 4.330127019 Simplifying x + 2.5 = 4.330127019 Reorder the terms: 2.5 + x = 4.330127019 Solving 2.5 + x = 4.330127019 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.5' to each side of the equation. 2.5 + -2.5 + x = 4.330127019 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + x = 4.330127019 + -2.5 x = 4.330127019 + -2.5 Combine like terms: 4.330127019 + -2.5 = 1.830127019 x = 1.830127019 Simplifying x = 1.830127019

Subproblem 2

x + 2.5 = -4.330127019 Simplifying x + 2.5 = -4.330127019 Reorder the terms: 2.5 + x = -4.330127019 Solving 2.5 + x = -4.330127019 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.5' to each side of the equation. 2.5 + -2.5 + x = -4.330127019 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + x = -4.330127019 + -2.5 x = -4.330127019 + -2.5 Combine like terms: -4.330127019 + -2.5 = -6.830127019 x = -6.830127019 Simplifying x = -6.830127019

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.830127019, -6.830127019}

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