(0.5)(x)(3x+3)=84

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Solution for (0.5)(x)(3x+3)=84 equation:


Simplifying
(0.5)(x)(3x + 3) = 84

Reorder the terms:
0.5x(3 + 3x) = 84
(3 * 0.5x + 3x * 0.5x) = 84
(1.5x + 1.5x2) = 84

Solving
1.5x + 1.5x2 = 84

Solving for variable 'x'.

Reorder the terms:
-84 + 1.5x + 1.5x2 = 84 + -84

Combine like terms: 84 + -84 = 0
-84 + 1.5x + 1.5x2 = 0

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

Divide each side by '1.5'.
-56 + x + x2 = 0

Move the constant term to the right:

Add '56' to each side of the equation.
-56 + x + 56 + x2 = 0 + 56

Reorder the terms:
-56 + 56 + x + x2 = 0 + 56

Combine like terms: -56 + 56 = 0
0 + x + x2 = 0 + 56
x + x2 = 0 + 56

Combine like terms: 0 + 56 = 56
x + x2 = 56

The x term is x.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
 + 0.25 + x2 = 56 + 0.25

Combine like terms:  + 0.25 = 1.25
1.25 + x2 = 56 + 0.25

Combine like terms: 56 + 0.25 = 56.25
1.25 + x2 = 56.25

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 56.25

Calculate the square root of the right side: 7.5

Break this problem into two subproblems by setting 
(x + 0.5) equal to 7.5 and -7.5.

Subproblem 1

x + 0.5 = 7.5 Simplifying x + 0.5 = 7.5 Reorder the terms: 0.5 + x = 7.5 Solving 0.5 + x = 7.5 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = 7.5 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 7.5 + -0.5 x = 7.5 + -0.5 Combine like terms: 7.5 + -0.5 = 7 x = 7 Simplifying x = 7

Subproblem 2

x + 0.5 = -7.5 Simplifying x + 0.5 = -7.5 Reorder the terms: 0.5 + x = -7.5 Solving 0.5 + x = -7.5 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = -7.5 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -7.5 + -0.5 x = -7.5 + -0.5 Combine like terms: -7.5 + -0.5 = -8 x = -8 Simplifying x = -8

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7, -8}

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