3x(2x-5)=8x-9

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Solution for 3x(2x-5)=8x-9 equation:


Simplifying
3x(2x + -5) = 8x + -9

Reorder the terms:
3x(-5 + 2x) = 8x + -9
(-5 * 3x + 2x * 3x) = 8x + -9
(-15x + 6x2) = 8x + -9

Reorder the terms:
-15x + 6x2 = -9 + 8x

Solving
-15x + 6x2 = -9 + 8x

Solving for variable 'x'.

Reorder the terms:
9 + -15x + -8x + 6x2 = -9 + 8x + 9 + -8x

Combine like terms: -15x + -8x = -23x
9 + -23x + 6x2 = -9 + 8x + 9 + -8x

Reorder the terms:
9 + -23x + 6x2 = -9 + 9 + 8x + -8x

Combine like terms: -9 + 9 = 0
9 + -23x + 6x2 = 0 + 8x + -8x
9 + -23x + 6x2 = 8x + -8x

Combine like terms: 8x + -8x = 0
9 + -23x + 6x2 = 0

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

Divide each side by '6'.
1.5 + -3.833333333x + x2 = 0

Move the constant term to the right:

Add '-1.5' to each side of the equation.
1.5 + -3.833333333x + -1.5 + x2 = 0 + -1.5

Reorder the terms:
1.5 + -1.5 + -3.833333333x + x2 = 0 + -1.5

Combine like terms: 1.5 + -1.5 = 0.0
0.0 + -3.833333333x + x2 = 0 + -1.5
-3.833333333x + x2 = 0 + -1.5

Combine like terms: 0 + -1.5 = -1.5
-3.833333333x + x2 = -1.5

The x term is -3.833333333x.  Take half its coefficient (-1.916666667).
Square it (3.673611112) and add it to both sides.

Add '3.673611112' to each side of the equation.
-3.833333333x + 3.673611112 + x2 = -1.5 + 3.673611112

Reorder the terms:
3.673611112 + -3.833333333x + x2 = -1.5 + 3.673611112

Combine like terms: -1.5 + 3.673611112 = 2.173611112
3.673611112 + -3.833333333x + x2 = 2.173611112

Factor a perfect square on the left side:
(x + -1.916666667)(x + -1.916666667) = 2.173611112

Calculate the square root of the right side: 1.474317168

Break this problem into two subproblems by setting 
(x + -1.916666667) equal to 1.474317168 and -1.474317168.

Subproblem 1

x + -1.916666667 = 1.474317168 Simplifying x + -1.916666667 = 1.474317168 Reorder the terms: -1.916666667 + x = 1.474317168 Solving -1.916666667 + x = 1.474317168 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.916666667' to each side of the equation. -1.916666667 + 1.916666667 + x = 1.474317168 + 1.916666667 Combine like terms: -1.916666667 + 1.916666667 = 0.000000000 0.000000000 + x = 1.474317168 + 1.916666667 x = 1.474317168 + 1.916666667 Combine like terms: 1.474317168 + 1.916666667 = 3.390983835 x = 3.390983835 Simplifying x = 3.390983835

Subproblem 2

x + -1.916666667 = -1.474317168 Simplifying x + -1.916666667 = -1.474317168 Reorder the terms: -1.916666667 + x = -1.474317168 Solving -1.916666667 + x = -1.474317168 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.916666667' to each side of the equation. -1.916666667 + 1.916666667 + x = -1.474317168 + 1.916666667 Combine like terms: -1.916666667 + 1.916666667 = 0.000000000 0.000000000 + x = -1.474317168 + 1.916666667 x = -1.474317168 + 1.916666667 Combine like terms: -1.474317168 + 1.916666667 = 0.442349499 x = 0.442349499 Simplifying x = 0.442349499

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.390983835, 0.442349499}

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