(2x-7)(4x+3)=12

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Solution for (2x-7)(4x+3)=12 equation:


Simplifying
(2x + -7)(4x + 3) = 12

Reorder the terms:
(-7 + 2x)(4x + 3) = 12

Reorder the terms:
(-7 + 2x)(3 + 4x) = 12

Multiply (-7 + 2x) * (3 + 4x)
(-7(3 + 4x) + 2x * (3 + 4x)) = 12
((3 * -7 + 4x * -7) + 2x * (3 + 4x)) = 12
((-21 + -28x) + 2x * (3 + 4x)) = 12
(-21 + -28x + (3 * 2x + 4x * 2x)) = 12
(-21 + -28x + (6x + 8x2)) = 12

Combine like terms: -28x + 6x = -22x
(-21 + -22x + 8x2) = 12

Solving
-21 + -22x + 8x2 = 12

Solving for variable 'x'.

Reorder the terms:
-21 + -12 + -22x + 8x2 = 12 + -12

Combine like terms: -21 + -12 = -33
-33 + -22x + 8x2 = 12 + -12

Combine like terms: 12 + -12 = 0
-33 + -22x + 8x2 = 0

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

Divide each side by '8'.
-4.125 + -2.75x + x2 = 0

Move the constant term to the right:

Add '4.125' to each side of the equation.
-4.125 + -2.75x + 4.125 + x2 = 0 + 4.125

Reorder the terms:
-4.125 + 4.125 + -2.75x + x2 = 0 + 4.125

Combine like terms: -4.125 + 4.125 = 0.000
0.000 + -2.75x + x2 = 0 + 4.125
-2.75x + x2 = 0 + 4.125

Combine like terms: 0 + 4.125 = 4.125
-2.75x + x2 = 4.125

The x term is -2.75x.  Take half its coefficient (-1.375).
Square it (1.890625) and add it to both sides.

Add '1.890625' to each side of the equation.
-2.75x + 1.890625 + x2 = 4.125 + 1.890625

Reorder the terms:
1.890625 + -2.75x + x2 = 4.125 + 1.890625

Combine like terms: 4.125 + 1.890625 = 6.015625
1.890625 + -2.75x + x2 = 6.015625

Factor a perfect square on the left side:
(x + -1.375)(x + -1.375) = 6.015625

Calculate the square root of the right side: 2.452677109

Break this problem into two subproblems by setting 
(x + -1.375) equal to 2.452677109 and -2.452677109.

Subproblem 1

x + -1.375 = 2.452677109 Simplifying x + -1.375 = 2.452677109 Reorder the terms: -1.375 + x = 2.452677109 Solving -1.375 + x = 2.452677109 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.375' to each side of the equation. -1.375 + 1.375 + x = 2.452677109 + 1.375 Combine like terms: -1.375 + 1.375 = 0.000 0.000 + x = 2.452677109 + 1.375 x = 2.452677109 + 1.375 Combine like terms: 2.452677109 + 1.375 = 3.827677109 x = 3.827677109 Simplifying x = 3.827677109

Subproblem 2

x + -1.375 = -2.452677109 Simplifying x + -1.375 = -2.452677109 Reorder the terms: -1.375 + x = -2.452677109 Solving -1.375 + x = -2.452677109 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.375' to each side of the equation. -1.375 + 1.375 + x = -2.452677109 + 1.375 Combine like terms: -1.375 + 1.375 = 0.000 0.000 + x = -2.452677109 + 1.375 x = -2.452677109 + 1.375 Combine like terms: -2.452677109 + 1.375 = -1.077677109 x = -1.077677109 Simplifying x = -1.077677109

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.827677109, -1.077677109}

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