0.3x(x+20)-0.02(x-60)=-9.6

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Solution for 0.3x(x+20)-0.02(x-60)=-9.6 equation:


Simplifying
0.3x(x + 20) + -0.02(x + -60) = -9.6

Reorder the terms:
0.3x(20 + x) + -0.02(x + -60) = -9.6
(20 * 0.3x + x * 0.3x) + -0.02(x + -60) = -9.6
(6x + 0.3x2) + -0.02(x + -60) = -9.6

Reorder the terms:
6x + 0.3x2 + -0.02(-60 + x) = -9.6
6x + 0.3x2 + (-60 * -0.02 + x * -0.02) = -9.6
6x + 0.3x2 + (1.2 + -0.02x) = -9.6

Reorder the terms:
1.2 + 6x + -0.02x + 0.3x2 = -9.6

Combine like terms: 6x + -0.02x = 5.98x
1.2 + 5.98x + 0.3x2 = -9.6

Solving
1.2 + 5.98x + 0.3x2 = -9.6

Solving for variable 'x'.

Reorder the terms:
1.2 + 9.6 + 5.98x + 0.3x2 = -9.6 + 9.6

Combine like terms: 1.2 + 9.6 = 10.8
10.8 + 5.98x + 0.3x2 = -9.6 + 9.6

Combine like terms: -9.6 + 9.6 = 0.0
10.8 + 5.98x + 0.3x2 = 0.0

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

Divide each side by '0.3'.
36 + 19.93333333x + x2 = 0

Move the constant term to the right:

Add '-36' to each side of the equation.
36 + 19.93333333x + -36 + x2 = 0 + -36

Reorder the terms:
36 + -36 + 19.93333333x + x2 = 0 + -36

Combine like terms: 36 + -36 = 0
0 + 19.93333333x + x2 = 0 + -36
19.93333333x + x2 = 0 + -36

Combine like terms: 0 + -36 = -36
19.93333333x + x2 = -36

The x term is 19.93333333x.  Take half its coefficient (9.966666665).
Square it (99.33444441) and add it to both sides.

Add '99.33444441' to each side of the equation.
19.93333333x + 99.33444441 + x2 = -36 + 99.33444441

Reorder the terms:
99.33444441 + 19.93333333x + x2 = -36 + 99.33444441

Combine like terms: -36 + 99.33444441 = 63.33444441
99.33444441 + 19.93333333x + x2 = 63.33444441

Factor a perfect square on the left side:
(x + 9.966666665)(x + 9.966666665) = 63.33444441

Calculate the square root of the right side: 7.958294064

Break this problem into two subproblems by setting 
(x + 9.966666665) equal to 7.958294064 and -7.958294064.

Subproblem 1

x + 9.966666665 = 7.958294064 Simplifying x + 9.966666665 = 7.958294064 Reorder the terms: 9.966666665 + x = 7.958294064 Solving 9.966666665 + x = 7.958294064 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9.966666665' to each side of the equation. 9.966666665 + -9.966666665 + x = 7.958294064 + -9.966666665 Combine like terms: 9.966666665 + -9.966666665 = 0.000000000 0.000000000 + x = 7.958294064 + -9.966666665 x = 7.958294064 + -9.966666665 Combine like terms: 7.958294064 + -9.966666665 = -2.008372601 x = -2.008372601 Simplifying x = -2.008372601

Subproblem 2

x + 9.966666665 = -7.958294064 Simplifying x + 9.966666665 = -7.958294064 Reorder the terms: 9.966666665 + x = -7.958294064 Solving 9.966666665 + x = -7.958294064 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9.966666665' to each side of the equation. 9.966666665 + -9.966666665 + x = -7.958294064 + -9.966666665 Combine like terms: 9.966666665 + -9.966666665 = 0.000000000 0.000000000 + x = -7.958294064 + -9.966666665 x = -7.958294064 + -9.966666665 Combine like terms: -7.958294064 + -9.966666665 = -17.924960729 x = -17.924960729 Simplifying x = -17.924960729

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-2.008372601, -17.924960729}

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