(7x-3)(12x-7)=180

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Solution for (7x-3)(12x-7)=180 equation:


Simplifying
(7x + -3)(12x + -7) = 180

Reorder the terms:
(-3 + 7x)(12x + -7) = 180

Reorder the terms:
(-3 + 7x)(-7 + 12x) = 180

Multiply (-3 + 7x) * (-7 + 12x)
(-3(-7 + 12x) + 7x * (-7 + 12x)) = 180
((-7 * -3 + 12x * -3) + 7x * (-7 + 12x)) = 180
((21 + -36x) + 7x * (-7 + 12x)) = 180
(21 + -36x + (-7 * 7x + 12x * 7x)) = 180
(21 + -36x + (-49x + 84x2)) = 180

Combine like terms: -36x + -49x = -85x
(21 + -85x + 84x2) = 180

Solving
21 + -85x + 84x2 = 180

Solving for variable 'x'.

Reorder the terms:
21 + -180 + -85x + 84x2 = 180 + -180

Combine like terms: 21 + -180 = -159
-159 + -85x + 84x2 = 180 + -180

Combine like terms: 180 + -180 = 0
-159 + -85x + 84x2 = 0

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

Divide each side by '84'.
-1.892857143 + -1.011904762x + x2 = 0

Move the constant term to the right:

Add '1.892857143' to each side of the equation.
-1.892857143 + -1.011904762x + 1.892857143 + x2 = 0 + 1.892857143

Reorder the terms:
-1.892857143 + 1.892857143 + -1.011904762x + x2 = 0 + 1.892857143

Combine like terms: -1.892857143 + 1.892857143 = 0.000000000
0.000000000 + -1.011904762x + x2 = 0 + 1.892857143
-1.011904762x + x2 = 0 + 1.892857143

Combine like terms: 0 + 1.892857143 = 1.892857143
-1.011904762x + x2 = 1.892857143

The x term is -1.011904762x.  Take half its coefficient (-0.505952381).
Square it (0.2559878118) and add it to both sides.

Add '0.2559878118' to each side of the equation.
-1.011904762x + 0.2559878118 + x2 = 1.892857143 + 0.2559878118

Reorder the terms:
0.2559878118 + -1.011904762x + x2 = 1.892857143 + 0.2559878118

Combine like terms: 1.892857143 + 0.2559878118 = 2.1488449548
0.2559878118 + -1.011904762x + x2 = 2.1488449548

Factor a perfect square on the left side:
(x + -0.505952381)(x + -0.505952381) = 2.1488449548

Calculate the square root of the right side: 1.46589391

Break this problem into two subproblems by setting 
(x + -0.505952381) equal to 1.46589391 and -1.46589391.

Subproblem 1

x + -0.505952381 = 1.46589391 Simplifying x + -0.505952381 = 1.46589391 Reorder the terms: -0.505952381 + x = 1.46589391 Solving -0.505952381 + x = 1.46589391 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.505952381' to each side of the equation. -0.505952381 + 0.505952381 + x = 1.46589391 + 0.505952381 Combine like terms: -0.505952381 + 0.505952381 = 0.000000000 0.000000000 + x = 1.46589391 + 0.505952381 x = 1.46589391 + 0.505952381 Combine like terms: 1.46589391 + 0.505952381 = 1.971846291 x = 1.971846291 Simplifying x = 1.971846291

Subproblem 2

x + -0.505952381 = -1.46589391 Simplifying x + -0.505952381 = -1.46589391 Reorder the terms: -0.505952381 + x = -1.46589391 Solving -0.505952381 + x = -1.46589391 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.505952381' to each side of the equation. -0.505952381 + 0.505952381 + x = -1.46589391 + 0.505952381 Combine like terms: -0.505952381 + 0.505952381 = 0.000000000 0.000000000 + x = -1.46589391 + 0.505952381 x = -1.46589391 + 0.505952381 Combine like terms: -1.46589391 + 0.505952381 = -0.959941529 x = -0.959941529 Simplifying x = -0.959941529

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.971846291, -0.959941529}

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