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

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


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

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

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

Multiply (-4 + 7x) * (2 + 3x)
(-4(2 + 3x) + 7x * (2 + 3x)) = 7
((2 * -4 + 3x * -4) + 7x * (2 + 3x)) = 7
((-8 + -12x) + 7x * (2 + 3x)) = 7
(-8 + -12x + (2 * 7x + 3x * 7x)) = 7
(-8 + -12x + (14x + 21x2)) = 7

Combine like terms: -12x + 14x = 2x
(-8 + 2x + 21x2) = 7

Solving
-8 + 2x + 21x2 = 7

Solving for variable 'x'.

Reorder the terms:
-8 + -7 + 2x + 21x2 = 7 + -7

Combine like terms: -8 + -7 = -15
-15 + 2x + 21x2 = 7 + -7

Combine like terms: 7 + -7 = 0
-15 + 2x + 21x2 = 0

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

Divide each side by '21'.
-0.7142857143 + 0.09523809524x + x2 = 0

Move the constant term to the right:

Add '0.7142857143' to each side of the equation.
-0.7142857143 + 0.09523809524x + 0.7142857143 + x2 = 0 + 0.7142857143

Reorder the terms:
-0.7142857143 + 0.7142857143 + 0.09523809524x + x2 = 0 + 0.7142857143

Combine like terms: -0.7142857143 + 0.7142857143 = 0.0000000000
0.0000000000 + 0.09523809524x + x2 = 0 + 0.7142857143
0.09523809524x + x2 = 0 + 0.7142857143

Combine like terms: 0 + 0.7142857143 = 0.7142857143
0.09523809524x + x2 = 0.7142857143

The x term is 0.09523809524x.  Take half its coefficient (0.04761904762).
Square it (0.002267573696) and add it to both sides.

Add '0.002267573696' to each side of the equation.
0.09523809524x + 0.002267573696 + x2 = 0.7142857143 + 0.002267573696

Reorder the terms:
0.002267573696 + 0.09523809524x + x2 = 0.7142857143 + 0.002267573696

Combine like terms: 0.7142857143 + 0.002267573696 = 0.716553287996
0.002267573696 + 0.09523809524x + x2 = 0.716553287996

Factor a perfect square on the left side:
(x + 0.04761904762)(x + 0.04761904762) = 0.716553287996

Calculate the square root of the right side: 0.846494706

Break this problem into two subproblems by setting 
(x + 0.04761904762) equal to 0.846494706 and -0.846494706.

Subproblem 1

x + 0.04761904762 = 0.846494706 Simplifying x + 0.04761904762 = 0.846494706 Reorder the terms: 0.04761904762 + x = 0.846494706 Solving 0.04761904762 + x = 0.846494706 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.04761904762' to each side of the equation. 0.04761904762 + -0.04761904762 + x = 0.846494706 + -0.04761904762 Combine like terms: 0.04761904762 + -0.04761904762 = 0.00000000000 0.00000000000 + x = 0.846494706 + -0.04761904762 x = 0.846494706 + -0.04761904762 Combine like terms: 0.846494706 + -0.04761904762 = 0.79887565838 x = 0.79887565838 Simplifying x = 0.79887565838

Subproblem 2

x + 0.04761904762 = -0.846494706 Simplifying x + 0.04761904762 = -0.846494706 Reorder the terms: 0.04761904762 + x = -0.846494706 Solving 0.04761904762 + x = -0.846494706 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.04761904762' to each side of the equation. 0.04761904762 + -0.04761904762 + x = -0.846494706 + -0.04761904762 Combine like terms: 0.04761904762 + -0.04761904762 = 0.00000000000 0.00000000000 + x = -0.846494706 + -0.04761904762 x = -0.846494706 + -0.04761904762 Combine like terms: -0.846494706 + -0.04761904762 = -0.89411375362 x = -0.89411375362 Simplifying x = -0.89411375362

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.79887565838, -0.89411375362}

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