(3x-2)(x+3)=55

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Solution for (3x-2)(x+3)=55 equation:


Simplifying
(3x + -2)(x + 3) = 55

Reorder the terms:
(-2 + 3x)(x + 3) = 55

Reorder the terms:
(-2 + 3x)(3 + x) = 55

Multiply (-2 + 3x) * (3 + x)
(-2(3 + x) + 3x * (3 + x)) = 55
((3 * -2 + x * -2) + 3x * (3 + x)) = 55
((-6 + -2x) + 3x * (3 + x)) = 55
(-6 + -2x + (3 * 3x + x * 3x)) = 55
(-6 + -2x + (9x + 3x2)) = 55

Combine like terms: -2x + 9x = 7x
(-6 + 7x + 3x2) = 55

Solving
-6 + 7x + 3x2 = 55

Solving for variable 'x'.

Reorder the terms:
-6 + -55 + 7x + 3x2 = 55 + -55

Combine like terms: -6 + -55 = -61
-61 + 7x + 3x2 = 55 + -55

Combine like terms: 55 + -55 = 0
-61 + 7x + 3x2 = 0

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

Divide each side by '3'.
-20.33333333 + 2.333333333x + x2 = 0

Move the constant term to the right:

Add '20.33333333' to each side of the equation.
-20.33333333 + 2.333333333x + 20.33333333 + x2 = 0 + 20.33333333

Reorder the terms:
-20.33333333 + 20.33333333 + 2.333333333x + x2 = 0 + 20.33333333

Combine like terms: -20.33333333 + 20.33333333 = 0.00000000
0.00000000 + 2.333333333x + x2 = 0 + 20.33333333
2.333333333x + x2 = 0 + 20.33333333

Combine like terms: 0 + 20.33333333 = 20.33333333
2.333333333x + x2 = 20.33333333

The x term is 2.333333333x.  Take half its coefficient (1.166666667).
Square it (1.361111112) and add it to both sides.

Add '1.361111112' to each side of the equation.
2.333333333x + 1.361111112 + x2 = 20.33333333 + 1.361111112

Reorder the terms:
1.361111112 + 2.333333333x + x2 = 20.33333333 + 1.361111112

Combine like terms: 20.33333333 + 1.361111112 = 21.694444442
1.361111112 + 2.333333333x + x2 = 21.694444442

Factor a perfect square on the left side:
(x + 1.166666667)(x + 1.166666667) = 21.694444442

Calculate the square root of the right side: 4.657729537

Break this problem into two subproblems by setting 
(x + 1.166666667) equal to 4.657729537 and -4.657729537.

Subproblem 1

x + 1.166666667 = 4.657729537 Simplifying x + 1.166666667 = 4.657729537 Reorder the terms: 1.166666667 + x = 4.657729537 Solving 1.166666667 + x = 4.657729537 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.166666667' to each side of the equation. 1.166666667 + -1.166666667 + x = 4.657729537 + -1.166666667 Combine like terms: 1.166666667 + -1.166666667 = 0.000000000 0.000000000 + x = 4.657729537 + -1.166666667 x = 4.657729537 + -1.166666667 Combine like terms: 4.657729537 + -1.166666667 = 3.49106287 x = 3.49106287 Simplifying x = 3.49106287

Subproblem 2

x + 1.166666667 = -4.657729537 Simplifying x + 1.166666667 = -4.657729537 Reorder the terms: 1.166666667 + x = -4.657729537 Solving 1.166666667 + x = -4.657729537 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.166666667' to each side of the equation. 1.166666667 + -1.166666667 + x = -4.657729537 + -1.166666667 Combine like terms: 1.166666667 + -1.166666667 = 0.000000000 0.000000000 + x = -4.657729537 + -1.166666667 x = -4.657729537 + -1.166666667 Combine like terms: -4.657729537 + -1.166666667 = -5.824396204 x = -5.824396204 Simplifying x = -5.824396204

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.49106287, -5.824396204}

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