3x(.5x+5)=26

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Solution for 3x(.5x+5)=26 equation:


Simplifying
3x(0.5x + 5) = 26

Reorder the terms:
3x(5 + 0.5x) = 26
(5 * 3x + 0.5x * 3x) = 26
(15x + 1.5x2) = 26

Solving
15x + 1.5x2 = 26

Solving for variable 'x'.

Reorder the terms:
-26 + 15x + 1.5x2 = 26 + -26

Combine like terms: 26 + -26 = 0
-26 + 15x + 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'.
-17.33333333 + 10x + x2 = 0

Move the constant term to the right:

Add '17.33333333' to each side of the equation.
-17.33333333 + 10x + 17.33333333 + x2 = 0 + 17.33333333

Reorder the terms:
-17.33333333 + 17.33333333 + 10x + x2 = 0 + 17.33333333

Combine like terms: -17.33333333 + 17.33333333 = 0.00000000
0.00000000 + 10x + x2 = 0 + 17.33333333
10x + x2 = 0 + 17.33333333

Combine like terms: 0 + 17.33333333 = 17.33333333
10x + x2 = 17.33333333

The x term is 10x.  Take half its coefficient (5).
Square it (25) and add it to both sides.

Add '25' to each side of the equation.
10x + 25 + x2 = 17.33333333 + 25

Reorder the terms:
25 + 10x + x2 = 17.33333333 + 25

Combine like terms: 17.33333333 + 25 = 42.33333333
25 + 10x + x2 = 42.33333333

Factor a perfect square on the left side:
(x + 5)(x + 5) = 42.33333333

Calculate the square root of the right side: 6.506407098

Break this problem into two subproblems by setting 
(x + 5) equal to 6.506407098 and -6.506407098.

Subproblem 1

x + 5 = 6.506407098 Simplifying x + 5 = 6.506407098 Reorder the terms: 5 + x = 6.506407098 Solving 5 + x = 6.506407098 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + x = 6.506407098 + -5 Combine like terms: 5 + -5 = 0 0 + x = 6.506407098 + -5 x = 6.506407098 + -5 Combine like terms: 6.506407098 + -5 = 1.506407098 x = 1.506407098 Simplifying x = 1.506407098

Subproblem 2

x + 5 = -6.506407098 Simplifying x + 5 = -6.506407098 Reorder the terms: 5 + x = -6.506407098 Solving 5 + x = -6.506407098 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + x = -6.506407098 + -5 Combine like terms: 5 + -5 = 0 0 + x = -6.506407098 + -5 x = -6.506407098 + -5 Combine like terms: -6.506407098 + -5 = -11.506407098 x = -11.506407098 Simplifying x = -11.506407098

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.506407098, -11.506407098}

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