(3x-2)(x-5)=28

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Solution for (3x-2)(x-5)=28 equation:


Simplifying
(3x + -2)(x + -5) = 28

Reorder the terms:
(-2 + 3x)(x + -5) = 28

Reorder the terms:
(-2 + 3x)(-5 + x) = 28

Multiply (-2 + 3x) * (-5 + x)
(-2(-5 + x) + 3x * (-5 + x)) = 28
((-5 * -2 + x * -2) + 3x * (-5 + x)) = 28
((10 + -2x) + 3x * (-5 + x)) = 28
(10 + -2x + (-5 * 3x + x * 3x)) = 28
(10 + -2x + (-15x + 3x2)) = 28

Combine like terms: -2x + -15x = -17x
(10 + -17x + 3x2) = 28

Solving
10 + -17x + 3x2 = 28

Solving for variable 'x'.

Reorder the terms:
10 + -28 + -17x + 3x2 = 28 + -28

Combine like terms: 10 + -28 = -18
-18 + -17x + 3x2 = 28 + -28

Combine like terms: 28 + -28 = 0
-18 + -17x + 3x2 = 0

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

Divide each side by '3'.
-6 + -5.666666667x + x2 = 0

Move the constant term to the right:

Add '6' to each side of the equation.
-6 + -5.666666667x + 6 + x2 = 0 + 6

Reorder the terms:
-6 + 6 + -5.666666667x + x2 = 0 + 6

Combine like terms: -6 + 6 = 0
0 + -5.666666667x + x2 = 0 + 6
-5.666666667x + x2 = 0 + 6

Combine like terms: 0 + 6 = 6
-5.666666667x + x2 = 6

The x term is -5.666666667x.  Take half its coefficient (-2.833333334).
Square it (8.027777782) and add it to both sides.

Add '8.027777782' to each side of the equation.
-5.666666667x + 8.027777782 + x2 = 6 + 8.027777782

Reorder the terms:
8.027777782 + -5.666666667x + x2 = 6 + 8.027777782

Combine like terms: 6 + 8.027777782 = 14.027777782
8.027777782 + -5.666666667x + x2 = 14.027777782

Factor a perfect square on the left side:
(x + -2.833333334)(x + -2.833333334) = 14.027777782

Calculate the square root of the right side: 3.74536751

Break this problem into two subproblems by setting 
(x + -2.833333334) equal to 3.74536751 and -3.74536751.

Subproblem 1

x + -2.833333334 = 3.74536751 Simplifying x + -2.833333334 = 3.74536751 Reorder the terms: -2.833333334 + x = 3.74536751 Solving -2.833333334 + x = 3.74536751 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.833333334' to each side of the equation. -2.833333334 + 2.833333334 + x = 3.74536751 + 2.833333334 Combine like terms: -2.833333334 + 2.833333334 = 0.000000000 0.000000000 + x = 3.74536751 + 2.833333334 x = 3.74536751 + 2.833333334 Combine like terms: 3.74536751 + 2.833333334 = 6.578700844 x = 6.578700844 Simplifying x = 6.578700844

Subproblem 2

x + -2.833333334 = -3.74536751 Simplifying x + -2.833333334 = -3.74536751 Reorder the terms: -2.833333334 + x = -3.74536751 Solving -2.833333334 + x = -3.74536751 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.833333334' to each side of the equation. -2.833333334 + 2.833333334 + x = -3.74536751 + 2.833333334 Combine like terms: -2.833333334 + 2.833333334 = 0.000000000 0.000000000 + x = -3.74536751 + 2.833333334 x = -3.74536751 + 2.833333334 Combine like terms: -3.74536751 + 2.833333334 = -0.912034176 x = -0.912034176 Simplifying x = -0.912034176

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.578700844, -0.912034176}

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