(3x-7)(5x+2)=10

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Solution for (3x-7)(5x+2)=10 equation:


Simplifying
(3x + -7)(5x + 2) = 10

Reorder the terms:
(-7 + 3x)(5x + 2) = 10

Reorder the terms:
(-7 + 3x)(2 + 5x) = 10

Multiply (-7 + 3x) * (2 + 5x)
(-7(2 + 5x) + 3x * (2 + 5x)) = 10
((2 * -7 + 5x * -7) + 3x * (2 + 5x)) = 10
((-14 + -35x) + 3x * (2 + 5x)) = 10
(-14 + -35x + (2 * 3x + 5x * 3x)) = 10
(-14 + -35x + (6x + 15x2)) = 10

Combine like terms: -35x + 6x = -29x
(-14 + -29x + 15x2) = 10

Solving
-14 + -29x + 15x2 = 10

Solving for variable 'x'.

Reorder the terms:
-14 + -10 + -29x + 15x2 = 10 + -10

Combine like terms: -14 + -10 = -24
-24 + -29x + 15x2 = 10 + -10

Combine like terms: 10 + -10 = 0
-24 + -29x + 15x2 = 0

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

Divide each side by '15'.
-1.6 + -1.933333333x + x2 = 0

Move the constant term to the right:

Add '1.6' to each side of the equation.
-1.6 + -1.933333333x + 1.6 + x2 = 0 + 1.6

Reorder the terms:
-1.6 + 1.6 + -1.933333333x + x2 = 0 + 1.6

Combine like terms: -1.6 + 1.6 = 0.0
0.0 + -1.933333333x + x2 = 0 + 1.6
-1.933333333x + x2 = 0 + 1.6

Combine like terms: 0 + 1.6 = 1.6
-1.933333333x + x2 = 1.6

The x term is -1.933333333x.  Take half its coefficient (-0.9666666665).
Square it (0.9344444441) and add it to both sides.

Add '0.9344444441' to each side of the equation.
-1.933333333x + 0.9344444441 + x2 = 1.6 + 0.9344444441

Reorder the terms:
0.9344444441 + -1.933333333x + x2 = 1.6 + 0.9344444441

Combine like terms: 1.6 + 0.9344444441 = 2.5344444441
0.9344444441 + -1.933333333x + x2 = 2.5344444441

Factor a perfect square on the left side:
(x + -0.9666666665)(x + -0.9666666665) = 2.5344444441

Calculate the square root of the right side: 1.591993858

Break this problem into two subproblems by setting 
(x + -0.9666666665) equal to 1.591993858 and -1.591993858.

Subproblem 1

x + -0.9666666665 = 1.591993858 Simplifying x + -0.9666666665 = 1.591993858 Reorder the terms: -0.9666666665 + x = 1.591993858 Solving -0.9666666665 + x = 1.591993858 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.9666666665' to each side of the equation. -0.9666666665 + 0.9666666665 + x = 1.591993858 + 0.9666666665 Combine like terms: -0.9666666665 + 0.9666666665 = 0.0000000000 0.0000000000 + x = 1.591993858 + 0.9666666665 x = 1.591993858 + 0.9666666665 Combine like terms: 1.591993858 + 0.9666666665 = 2.5586605245 x = 2.5586605245 Simplifying x = 2.5586605245

Subproblem 2

x + -0.9666666665 = -1.591993858 Simplifying x + -0.9666666665 = -1.591993858 Reorder the terms: -0.9666666665 + x = -1.591993858 Solving -0.9666666665 + x = -1.591993858 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.9666666665' to each side of the equation. -0.9666666665 + 0.9666666665 + x = -1.591993858 + 0.9666666665 Combine like terms: -0.9666666665 + 0.9666666665 = 0.0000000000 0.0000000000 + x = -1.591993858 + 0.9666666665 x = -1.591993858 + 0.9666666665 Combine like terms: -1.591993858 + 0.9666666665 = -0.6253271915 x = -0.6253271915 Simplifying x = -0.6253271915

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.5586605245, -0.6253271915}

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