(3x-2)(5x+7)=(4-5x)

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Solution for (3x-2)(5x+7)=(4-5x) equation:


Simplifying
(3x + -2)(5x + 7) = (4 + -5x)

Reorder the terms:
(-2 + 3x)(5x + 7) = (4 + -5x)

Reorder the terms:
(-2 + 3x)(7 + 5x) = (4 + -5x)

Multiply (-2 + 3x) * (7 + 5x)
(-2(7 + 5x) + 3x * (7 + 5x)) = (4 + -5x)
((7 * -2 + 5x * -2) + 3x * (7 + 5x)) = (4 + -5x)
((-14 + -10x) + 3x * (7 + 5x)) = (4 + -5x)
(-14 + -10x + (7 * 3x + 5x * 3x)) = (4 + -5x)
(-14 + -10x + (21x + 15x2)) = (4 + -5x)

Combine like terms: -10x + 21x = 11x
(-14 + 11x + 15x2) = (4 + -5x)

Remove parenthesis around (4 + -5x)
-14 + 11x + 15x2 = 4 + -5x

Solving
-14 + 11x + 15x2 = 4 + -5x

Solving for variable 'x'.

Reorder the terms:
-14 + -4 + 11x + 5x + 15x2 = 4 + -5x + -4 + 5x

Combine like terms: -14 + -4 = -18
-18 + 11x + 5x + 15x2 = 4 + -5x + -4 + 5x

Combine like terms: 11x + 5x = 16x
-18 + 16x + 15x2 = 4 + -5x + -4 + 5x

Reorder the terms:
-18 + 16x + 15x2 = 4 + -4 + -5x + 5x

Combine like terms: 4 + -4 = 0
-18 + 16x + 15x2 = 0 + -5x + 5x
-18 + 16x + 15x2 = -5x + 5x

Combine like terms: -5x + 5x = 0
-18 + 16x + 15x2 = 0

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

Divide each side by '15'.
-1.2 + 1.066666667x + x2 = 0

Move the constant term to the right:

Add '1.2' to each side of the equation.
-1.2 + 1.066666667x + 1.2 + x2 = 0 + 1.2

Reorder the terms:
-1.2 + 1.2 + 1.066666667x + x2 = 0 + 1.2

Combine like terms: -1.2 + 1.2 = 0.0
0.0 + 1.066666667x + x2 = 0 + 1.2
1.066666667x + x2 = 0 + 1.2

Combine like terms: 0 + 1.2 = 1.2
1.066666667x + x2 = 1.2

The x term is 1.066666667x.  Take half its coefficient (0.5333333335).
Square it (0.2844444446) and add it to both sides.

Add '0.2844444446' to each side of the equation.
1.066666667x + 0.2844444446 + x2 = 1.2 + 0.2844444446

Reorder the terms:
0.2844444446 + 1.066666667x + x2 = 1.2 + 0.2844444446

Combine like terms: 1.2 + 0.2844444446 = 1.4844444446
0.2844444446 + 1.066666667x + x2 = 1.4844444446

Factor a perfect square on the left side:
(x + 0.5333333335)(x + 0.5333333335) = 1.4844444446

Calculate the square root of the right side: 1.218377792

Break this problem into two subproblems by setting 
(x + 0.5333333335) equal to 1.218377792 and -1.218377792.

Subproblem 1

x + 0.5333333335 = 1.218377792 Simplifying x + 0.5333333335 = 1.218377792 Reorder the terms: 0.5333333335 + x = 1.218377792 Solving 0.5333333335 + x = 1.218377792 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5333333335' to each side of the equation. 0.5333333335 + -0.5333333335 + x = 1.218377792 + -0.5333333335 Combine like terms: 0.5333333335 + -0.5333333335 = 0.0000000000 0.0000000000 + x = 1.218377792 + -0.5333333335 x = 1.218377792 + -0.5333333335 Combine like terms: 1.218377792 + -0.5333333335 = 0.6850444585 x = 0.6850444585 Simplifying x = 0.6850444585

Subproblem 2

x + 0.5333333335 = -1.218377792 Simplifying x + 0.5333333335 = -1.218377792 Reorder the terms: 0.5333333335 + x = -1.218377792 Solving 0.5333333335 + x = -1.218377792 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5333333335' to each side of the equation. 0.5333333335 + -0.5333333335 + x = -1.218377792 + -0.5333333335 Combine like terms: 0.5333333335 + -0.5333333335 = 0.0000000000 0.0000000000 + x = -1.218377792 + -0.5333333335 x = -1.218377792 + -0.5333333335 Combine like terms: -1.218377792 + -0.5333333335 = -1.7517111255 x = -1.7517111255 Simplifying x = -1.7517111255

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.6850444585, -1.7517111255}

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