3x(2x+7)=2(3x+11)

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Solution for 3x(2x+7)=2(3x+11) equation:


Simplifying
3x(2x + 7) = 2(3x + 11)

Reorder the terms:
3x(7 + 2x) = 2(3x + 11)
(7 * 3x + 2x * 3x) = 2(3x + 11)
(21x + 6x2) = 2(3x + 11)

Reorder the terms:
21x + 6x2 = 2(11 + 3x)
21x + 6x2 = (11 * 2 + 3x * 2)
21x + 6x2 = (22 + 6x)

Solving
21x + 6x2 = 22 + 6x

Solving for variable 'x'.

Reorder the terms:
-22 + 21x + -6x + 6x2 = 22 + 6x + -22 + -6x

Combine like terms: 21x + -6x = 15x
-22 + 15x + 6x2 = 22 + 6x + -22 + -6x

Reorder the terms:
-22 + 15x + 6x2 = 22 + -22 + 6x + -6x

Combine like terms: 22 + -22 = 0
-22 + 15x + 6x2 = 0 + 6x + -6x
-22 + 15x + 6x2 = 6x + -6x

Combine like terms: 6x + -6x = 0
-22 + 15x + 6x2 = 0

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

Divide each side by '6'.
-3.666666667 + 2.5x + x2 = 0

Move the constant term to the right:

Add '3.666666667' to each side of the equation.
-3.666666667 + 2.5x + 3.666666667 + x2 = 0 + 3.666666667

Reorder the terms:
-3.666666667 + 3.666666667 + 2.5x + x2 = 0 + 3.666666667

Combine like terms: -3.666666667 + 3.666666667 = 0.000000000
0.000000000 + 2.5x + x2 = 0 + 3.666666667
2.5x + x2 = 0 + 3.666666667

Combine like terms: 0 + 3.666666667 = 3.666666667
2.5x + x2 = 3.666666667

The x term is 2.5x.  Take half its coefficient (1.25).
Square it (1.5625) and add it to both sides.

Add '1.5625' to each side of the equation.
2.5x + 1.5625 + x2 = 3.666666667 + 1.5625

Reorder the terms:
1.5625 + 2.5x + x2 = 3.666666667 + 1.5625

Combine like terms: 3.666666667 + 1.5625 = 5.229166667
1.5625 + 2.5x + x2 = 5.229166667

Factor a perfect square on the left side:
(x + 1.25)(x + 1.25) = 5.229166667

Calculate the square root of the right side: 2.286737122

Break this problem into two subproblems by setting 
(x + 1.25) equal to 2.286737122 and -2.286737122.

Subproblem 1

x + 1.25 = 2.286737122 Simplifying x + 1.25 = 2.286737122 Reorder the terms: 1.25 + x = 2.286737122 Solving 1.25 + x = 2.286737122 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.25' to each side of the equation. 1.25 + -1.25 + x = 2.286737122 + -1.25 Combine like terms: 1.25 + -1.25 = 0.00 0.00 + x = 2.286737122 + -1.25 x = 2.286737122 + -1.25 Combine like terms: 2.286737122 + -1.25 = 1.036737122 x = 1.036737122 Simplifying x = 1.036737122

Subproblem 2

x + 1.25 = -2.286737122 Simplifying x + 1.25 = -2.286737122 Reorder the terms: 1.25 + x = -2.286737122 Solving 1.25 + x = -2.286737122 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.25' to each side of the equation. 1.25 + -1.25 + x = -2.286737122 + -1.25 Combine like terms: 1.25 + -1.25 = 0.00 0.00 + x = -2.286737122 + -1.25 x = -2.286737122 + -1.25 Combine like terms: -2.286737122 + -1.25 = -3.536737122 x = -3.536737122 Simplifying x = -3.536737122

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.036737122, -3.536737122}

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