4(x+3)(2x-3)=9

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Solution for 4(x+3)(2x-3)=9 equation:


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

Reorder the terms:
4(3 + x)(2x + -3) = 9

Reorder the terms:
4(3 + x)(-3 + 2x) = 9

Multiply (3 + x) * (-3 + 2x)
4(3(-3 + 2x) + x(-3 + 2x)) = 9
4((-3 * 3 + 2x * 3) + x(-3 + 2x)) = 9
4((-9 + 6x) + x(-3 + 2x)) = 9
4(-9 + 6x + (-3 * x + 2x * x)) = 9
4(-9 + 6x + (-3x + 2x2)) = 9

Combine like terms: 6x + -3x = 3x
4(-9 + 3x + 2x2) = 9
(-9 * 4 + 3x * 4 + 2x2 * 4) = 9
(-36 + 12x + 8x2) = 9

Solving
-36 + 12x + 8x2 = 9

Solving for variable 'x'.

Reorder the terms:
-36 + -9 + 12x + 8x2 = 9 + -9

Combine like terms: -36 + -9 = -45
-45 + 12x + 8x2 = 9 + -9

Combine like terms: 9 + -9 = 0
-45 + 12x + 8x2 = 0

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

Divide each side by '8'.
-5.625 + 1.5x + x2 = 0

Move the constant term to the right:

Add '5.625' to each side of the equation.
-5.625 + 1.5x + 5.625 + x2 = 0 + 5.625

Reorder the terms:
-5.625 + 5.625 + 1.5x + x2 = 0 + 5.625

Combine like terms: -5.625 + 5.625 = 0.000
0.000 + 1.5x + x2 = 0 + 5.625
1.5x + x2 = 0 + 5.625

Combine like terms: 0 + 5.625 = 5.625
1.5x + x2 = 5.625

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 = 5.625 + 0.5625

Reorder the terms:
0.5625 + 1.5x + x2 = 5.625 + 0.5625

Combine like terms: 5.625 + 0.5625 = 6.1875
0.5625 + 1.5x + x2 = 6.1875

Factor a perfect square on the left side:
(x + 0.75)(x + 0.75) = 6.1875

Calculate the square root of the right side: 2.487468593

Break this problem into two subproblems by setting 
(x + 0.75) equal to 2.487468593 and -2.487468593.

Subproblem 1

x + 0.75 = 2.487468593 Simplifying x + 0.75 = 2.487468593 Reorder the terms: 0.75 + x = 2.487468593 Solving 0.75 + x = 2.487468593 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 = 2.487468593 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + x = 2.487468593 + -0.75 x = 2.487468593 + -0.75 Combine like terms: 2.487468593 + -0.75 = 1.737468593 x = 1.737468593 Simplifying x = 1.737468593

Subproblem 2

x + 0.75 = -2.487468593 Simplifying x + 0.75 = -2.487468593 Reorder the terms: 0.75 + x = -2.487468593 Solving 0.75 + x = -2.487468593 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 = -2.487468593 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + x = -2.487468593 + -0.75 x = -2.487468593 + -0.75 Combine like terms: -2.487468593 + -0.75 = -3.237468593 x = -3.237468593 Simplifying x = -3.237468593

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.737468593, -3.237468593}

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