5x(x+3)=2(x+6)

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Solution for 5x(x+3)=2(x+6) equation:


Simplifying
5x(x + 3) = 2(x + 6)

Reorder the terms:
5x(3 + x) = 2(x + 6)
(3 * 5x + x * 5x) = 2(x + 6)
(15x + 5x2) = 2(x + 6)

Reorder the terms:
15x + 5x2 = 2(6 + x)
15x + 5x2 = (6 * 2 + x * 2)
15x + 5x2 = (12 + 2x)

Solving
15x + 5x2 = 12 + 2x

Solving for variable 'x'.

Reorder the terms:
-12 + 15x + -2x + 5x2 = 12 + 2x + -12 + -2x

Combine like terms: 15x + -2x = 13x
-12 + 13x + 5x2 = 12 + 2x + -12 + -2x

Reorder the terms:
-12 + 13x + 5x2 = 12 + -12 + 2x + -2x

Combine like terms: 12 + -12 = 0
-12 + 13x + 5x2 = 0 + 2x + -2x
-12 + 13x + 5x2 = 2x + -2x

Combine like terms: 2x + -2x = 0
-12 + 13x + 5x2 = 0

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

Divide each side by '5'.
-2.4 + 2.6x + x2 = 0

Move the constant term to the right:

Add '2.4' to each side of the equation.
-2.4 + 2.6x + 2.4 + x2 = 0 + 2.4

Reorder the terms:
-2.4 + 2.4 + 2.6x + x2 = 0 + 2.4

Combine like terms: -2.4 + 2.4 = 0.0
0.0 + 2.6x + x2 = 0 + 2.4
2.6x + x2 = 0 + 2.4

Combine like terms: 0 + 2.4 = 2.4
2.6x + x2 = 2.4

The x term is 2.6x.  Take half its coefficient (1.3).
Square it (1.69) and add it to both sides.

Add '1.69' to each side of the equation.
2.6x + 1.69 + x2 = 2.4 + 1.69

Reorder the terms:
1.69 + 2.6x + x2 = 2.4 + 1.69

Combine like terms: 2.4 + 1.69 = 4.09
1.69 + 2.6x + x2 = 4.09

Factor a perfect square on the left side:
(x + 1.3)(x + 1.3) = 4.09

Calculate the square root of the right side: 2.022374842

Break this problem into two subproblems by setting 
(x + 1.3) equal to 2.022374842 and -2.022374842.

Subproblem 1

x + 1.3 = 2.022374842 Simplifying x + 1.3 = 2.022374842 Reorder the terms: 1.3 + x = 2.022374842 Solving 1.3 + x = 2.022374842 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.3' to each side of the equation. 1.3 + -1.3 + x = 2.022374842 + -1.3 Combine like terms: 1.3 + -1.3 = 0.0 0.0 + x = 2.022374842 + -1.3 x = 2.022374842 + -1.3 Combine like terms: 2.022374842 + -1.3 = 0.722374842 x = 0.722374842 Simplifying x = 0.722374842

Subproblem 2

x + 1.3 = -2.022374842 Simplifying x + 1.3 = -2.022374842 Reorder the terms: 1.3 + x = -2.022374842 Solving 1.3 + x = -2.022374842 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.3' to each side of the equation. 1.3 + -1.3 + x = -2.022374842 + -1.3 Combine like terms: 1.3 + -1.3 = 0.0 0.0 + x = -2.022374842 + -1.3 x = -2.022374842 + -1.3 Combine like terms: -2.022374842 + -1.3 = -3.322374842 x = -3.322374842 Simplifying x = -3.322374842

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.722374842, -3.322374842}

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