3x(x+20)=8

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Solution for 3x(x+20)=8 equation:


Simplifying
3x(x + 20) = 8

Reorder the terms:
3x(20 + x) = 8
(20 * 3x + x * 3x) = 8
(60x + 3x2) = 8

Solving
60x + 3x2 = 8

Solving for variable 'x'.

Reorder the terms:
-8 + 60x + 3x2 = 8 + -8

Combine like terms: 8 + -8 = 0
-8 + 60x + 3x2 = 0

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

Divide each side by '3'.
-2.666666667 + 20x + x2 = 0

Move the constant term to the right:

Add '2.666666667' to each side of the equation.
-2.666666667 + 20x + 2.666666667 + x2 = 0 + 2.666666667

Reorder the terms:
-2.666666667 + 2.666666667 + 20x + x2 = 0 + 2.666666667

Combine like terms: -2.666666667 + 2.666666667 = 0.000000000
0.000000000 + 20x + x2 = 0 + 2.666666667
20x + x2 = 0 + 2.666666667

Combine like terms: 0 + 2.666666667 = 2.666666667
20x + x2 = 2.666666667

The x term is 20x.  Take half its coefficient (10).
Square it (100) and add it to both sides.

Add '100' to each side of the equation.
20x + 100 + x2 = 2.666666667 + 100

Reorder the terms:
100 + 20x + x2 = 2.666666667 + 100

Combine like terms: 2.666666667 + 100 = 102.666666667
100 + 20x + x2 = 102.666666667

Factor a perfect square on the left side:
(x + 10)(x + 10) = 102.666666667

Calculate the square root of the right side: 10.132456102

Break this problem into two subproblems by setting 
(x + 10) equal to 10.132456102 and -10.132456102.

Subproblem 1

x + 10 = 10.132456102 Simplifying x + 10 = 10.132456102 Reorder the terms: 10 + x = 10.132456102 Solving 10 + x = 10.132456102 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-10' to each side of the equation. 10 + -10 + x = 10.132456102 + -10 Combine like terms: 10 + -10 = 0 0 + x = 10.132456102 + -10 x = 10.132456102 + -10 Combine like terms: 10.132456102 + -10 = 0.132456102 x = 0.132456102 Simplifying x = 0.132456102

Subproblem 2

x + 10 = -10.132456102 Simplifying x + 10 = -10.132456102 Reorder the terms: 10 + x = -10.132456102 Solving 10 + x = -10.132456102 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-10' to each side of the equation. 10 + -10 + x = -10.132456102 + -10 Combine like terms: 10 + -10 = 0 0 + x = -10.132456102 + -10 x = -10.132456102 + -10 Combine like terms: -10.132456102 + -10 = -20.132456102 x = -20.132456102 Simplifying x = -20.132456102

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.132456102, -20.132456102}

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