8x(2x-3)=9

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


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

Reorder the terms:
8x(-3 + 2x) = 9
(-3 * 8x + 2x * 8x) = 9
(-24x + 16x2) = 9

Solving
-24x + 16x2 = 9

Solving for variable 'x'.

Reorder the terms:
-9 + -24x + 16x2 = 9 + -9

Combine like terms: 9 + -9 = 0
-9 + -24x + 16x2 = 0

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

Divide each side by '16'.
-0.5625 + -1.5x + x2 = 0

Move the constant term to the right:

Add '0.5625' to each side of the equation.
-0.5625 + -1.5x + 0.5625 + x2 = 0 + 0.5625

Reorder the terms:
-0.5625 + 0.5625 + -1.5x + x2 = 0 + 0.5625

Combine like terms: -0.5625 + 0.5625 = 0.0000
0.0000 + -1.5x + x2 = 0 + 0.5625
-1.5x + x2 = 0 + 0.5625

Combine like terms: 0 + 0.5625 = 0.5625
-1.5x + x2 = 0.5625

The x term is -1.5x.  Take half its coefficient (-0.75).
Square it (0.5625) and add it to both sides.

Add '0.5625' to each side of the equation.
-1.5x + 0.5625 + x2 = 0.5625 + 0.5625

Reorder the terms:
0.5625 + -1.5x + x2 = 0.5625 + 0.5625

Combine like terms: 0.5625 + 0.5625 = 1.125
0.5625 + -1.5x + x2 = 1.125

Factor a perfect square on the left side:
(x + -0.75)(x + -0.75) = 1.125

Calculate the square root of the right side: 1.060660172

Break this problem into two subproblems by setting 
(x + -0.75) equal to 1.060660172 and -1.060660172.

Subproblem 1

x + -0.75 = 1.060660172 Simplifying x + -0.75 = 1.060660172 Reorder the terms: -0.75 + x = 1.060660172 Solving -0.75 + x = 1.060660172 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.75' to each side of the equation. -0.75 + 0.75 + x = 1.060660172 + 0.75 Combine like terms: -0.75 + 0.75 = 0.00 0.00 + x = 1.060660172 + 0.75 x = 1.060660172 + 0.75 Combine like terms: 1.060660172 + 0.75 = 1.810660172 x = 1.810660172 Simplifying x = 1.810660172

Subproblem 2

x + -0.75 = -1.060660172 Simplifying x + -0.75 = -1.060660172 Reorder the terms: -0.75 + x = -1.060660172 Solving -0.75 + x = -1.060660172 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.75' to each side of the equation. -0.75 + 0.75 + x = -1.060660172 + 0.75 Combine like terms: -0.75 + 0.75 = 0.00 0.00 + x = -1.060660172 + 0.75 x = -1.060660172 + 0.75 Combine like terms: -1.060660172 + 0.75 = -0.310660172 x = -0.310660172 Simplifying x = -0.310660172

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.810660172, -0.310660172}

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