(5x+7)(15x-7)=180

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Solution for (5x+7)(15x-7)=180 equation:


Simplifying
(5x + 7)(15x + -7) = 180

Reorder the terms:
(7 + 5x)(15x + -7) = 180

Reorder the terms:
(7 + 5x)(-7 + 15x) = 180

Multiply (7 + 5x) * (-7 + 15x)
(7(-7 + 15x) + 5x * (-7 + 15x)) = 180
((-7 * 7 + 15x * 7) + 5x * (-7 + 15x)) = 180
((-49 + 105x) + 5x * (-7 + 15x)) = 180
(-49 + 105x + (-7 * 5x + 15x * 5x)) = 180
(-49 + 105x + (-35x + 75x2)) = 180

Combine like terms: 105x + -35x = 70x
(-49 + 70x + 75x2) = 180

Solving
-49 + 70x + 75x2 = 180

Solving for variable 'x'.

Reorder the terms:
-49 + -180 + 70x + 75x2 = 180 + -180

Combine like terms: -49 + -180 = -229
-229 + 70x + 75x2 = 180 + -180

Combine like terms: 180 + -180 = 0
-229 + 70x + 75x2 = 0

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

Divide each side by '75'.
-3.053333333 + 0.9333333333x + x2 = 0

Move the constant term to the right:

Add '3.053333333' to each side of the equation.
-3.053333333 + 0.9333333333x + 3.053333333 + x2 = 0 + 3.053333333

Reorder the terms:
-3.053333333 + 3.053333333 + 0.9333333333x + x2 = 0 + 3.053333333

Combine like terms: -3.053333333 + 3.053333333 = 0.000000000
0.000000000 + 0.9333333333x + x2 = 0 + 3.053333333
0.9333333333x + x2 = 0 + 3.053333333

Combine like terms: 0 + 3.053333333 = 3.053333333
0.9333333333x + x2 = 3.053333333

The x term is 0.9333333333x.  Take half its coefficient (0.4666666667).
Square it (0.2177777778) and add it to both sides.

Add '0.2177777778' to each side of the equation.
0.9333333333x + 0.2177777778 + x2 = 3.053333333 + 0.2177777778

Reorder the terms:
0.2177777778 + 0.9333333333x + x2 = 3.053333333 + 0.2177777778

Combine like terms: 3.053333333 + 0.2177777778 = 3.2711111108
0.2177777778 + 0.9333333333x + x2 = 3.2711111108

Factor a perfect square on the left side:
(x + 0.4666666667)(x + 0.4666666667) = 3.2711111108

Calculate the square root of the right side: 1.808621329

Break this problem into two subproblems by setting 
(x + 0.4666666667) equal to 1.808621329 and -1.808621329.

Subproblem 1

x + 0.4666666667 = 1.808621329 Simplifying x + 0.4666666667 = 1.808621329 Reorder the terms: 0.4666666667 + x = 1.808621329 Solving 0.4666666667 + x = 1.808621329 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.4666666667' to each side of the equation. 0.4666666667 + -0.4666666667 + x = 1.808621329 + -0.4666666667 Combine like terms: 0.4666666667 + -0.4666666667 = 0.0000000000 0.0000000000 + x = 1.808621329 + -0.4666666667 x = 1.808621329 + -0.4666666667 Combine like terms: 1.808621329 + -0.4666666667 = 1.3419546623 x = 1.3419546623 Simplifying x = 1.3419546623

Subproblem 2

x + 0.4666666667 = -1.808621329 Simplifying x + 0.4666666667 = -1.808621329 Reorder the terms: 0.4666666667 + x = -1.808621329 Solving 0.4666666667 + x = -1.808621329 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.4666666667' to each side of the equation. 0.4666666667 + -0.4666666667 + x = -1.808621329 + -0.4666666667 Combine like terms: 0.4666666667 + -0.4666666667 = 0.0000000000 0.0000000000 + x = -1.808621329 + -0.4666666667 x = -1.808621329 + -0.4666666667 Combine like terms: -1.808621329 + -0.4666666667 = -2.2752879957 x = -2.2752879957 Simplifying x = -2.2752879957

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.3419546623, -2.2752879957}

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