(3X+2)(2X+1)=676

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Solution for (3X+2)(2X+1)=676 equation:


Simplifying
(3X + 2)(2X + 1) = 676

Reorder the terms:
(2 + 3X)(2X + 1) = 676

Reorder the terms:
(2 + 3X)(1 + 2X) = 676

Multiply (2 + 3X) * (1 + 2X)
(2(1 + 2X) + 3X * (1 + 2X)) = 676
((1 * 2 + 2X * 2) + 3X * (1 + 2X)) = 676
((2 + 4X) + 3X * (1 + 2X)) = 676
(2 + 4X + (1 * 3X + 2X * 3X)) = 676
(2 + 4X + (3X + 6X2)) = 676

Combine like terms: 4X + 3X = 7X
(2 + 7X + 6X2) = 676

Solving
2 + 7X + 6X2 = 676

Solving for variable 'X'.

Reorder the terms:
2 + -676 + 7X + 6X2 = 676 + -676

Combine like terms: 2 + -676 = -674
-674 + 7X + 6X2 = 676 + -676

Combine like terms: 676 + -676 = 0
-674 + 7X + 6X2 = 0

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

Divide each side by '6'.
-112.3333333 + 1.166666667X + X2 = 0

Move the constant term to the right:

Add '112.3333333' to each side of the equation.
-112.3333333 + 1.166666667X + 112.3333333 + X2 = 0 + 112.3333333

Reorder the terms:
-112.3333333 + 112.3333333 + 1.166666667X + X2 = 0 + 112.3333333

Combine like terms: -112.3333333 + 112.3333333 = 0.0000000
0.0000000 + 1.166666667X + X2 = 0 + 112.3333333
1.166666667X + X2 = 0 + 112.3333333

Combine like terms: 0 + 112.3333333 = 112.3333333
1.166666667X + X2 = 112.3333333

The X term is 1.166666667X.  Take half its coefficient (0.5833333335).
Square it (0.3402777780) and add it to both sides.

Add '0.3402777780' to each side of the equation.
1.166666667X + 0.3402777780 + X2 = 112.3333333 + 0.3402777780

Reorder the terms:
0.3402777780 + 1.166666667X + X2 = 112.3333333 + 0.3402777780

Combine like terms: 112.3333333 + 0.3402777780 = 112.673611078
0.3402777780 + 1.166666667X + X2 = 112.673611078

Factor a perfect square on the left side:
(X + 0.5833333335)(X + 0.5833333335) = 112.673611078

Calculate the square root of the right side: 10.614782667

Break this problem into two subproblems by setting 
(X + 0.5833333335) equal to 10.614782667 and -10.614782667.

Subproblem 1

X + 0.5833333335 = 10.614782667 Simplifying X + 0.5833333335 = 10.614782667 Reorder the terms: 0.5833333335 + X = 10.614782667 Solving 0.5833333335 + X = 10.614782667 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-0.5833333335' to each side of the equation. 0.5833333335 + -0.5833333335 + X = 10.614782667 + -0.5833333335 Combine like terms: 0.5833333335 + -0.5833333335 = 0.0000000000 0.0000000000 + X = 10.614782667 + -0.5833333335 X = 10.614782667 + -0.5833333335 Combine like terms: 10.614782667 + -0.5833333335 = 10.0314493335 X = 10.0314493335 Simplifying X = 10.0314493335

Subproblem 2

X + 0.5833333335 = -10.614782667 Simplifying X + 0.5833333335 = -10.614782667 Reorder the terms: 0.5833333335 + X = -10.614782667 Solving 0.5833333335 + X = -10.614782667 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-0.5833333335' to each side of the equation. 0.5833333335 + -0.5833333335 + X = -10.614782667 + -0.5833333335 Combine like terms: 0.5833333335 + -0.5833333335 = 0.0000000000 0.0000000000 + X = -10.614782667 + -0.5833333335 X = -10.614782667 + -0.5833333335 Combine like terms: -10.614782667 + -0.5833333335 = -11.1981160005 X = -11.1981160005 Simplifying X = -11.1981160005

Solution

The solution to the problem is based on the solutions from the subproblems. X = {10.0314493335, -11.1981160005}

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