(3x+5)(x-10)=180

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Solution for (3x+5)(x-10)=180 equation:


Simplifying
(3x + 5)(x + -10) = 180

Reorder the terms:
(5 + 3x)(x + -10) = 180

Reorder the terms:
(5 + 3x)(-10 + x) = 180

Multiply (5 + 3x) * (-10 + x)
(5(-10 + x) + 3x * (-10 + x)) = 180
((-10 * 5 + x * 5) + 3x * (-10 + x)) = 180
((-50 + 5x) + 3x * (-10 + x)) = 180
(-50 + 5x + (-10 * 3x + x * 3x)) = 180
(-50 + 5x + (-30x + 3x2)) = 180

Combine like terms: 5x + -30x = -25x
(-50 + -25x + 3x2) = 180

Solving
-50 + -25x + 3x2 = 180

Solving for variable 'x'.

Reorder the terms:
-50 + -180 + -25x + 3x2 = 180 + -180

Combine like terms: -50 + -180 = -230
-230 + -25x + 3x2 = 180 + -180

Combine like terms: 180 + -180 = 0
-230 + -25x + 3x2 = 0

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

Divide each side by '3'.
-76.66666667 + -8.333333333x + x2 = 0

Move the constant term to the right:

Add '76.66666667' to each side of the equation.
-76.66666667 + -8.333333333x + 76.66666667 + x2 = 0 + 76.66666667

Reorder the terms:
-76.66666667 + 76.66666667 + -8.333333333x + x2 = 0 + 76.66666667

Combine like terms: -76.66666667 + 76.66666667 = 0.00000000
0.00000000 + -8.333333333x + x2 = 0 + 76.66666667
-8.333333333x + x2 = 0 + 76.66666667

Combine like terms: 0 + 76.66666667 = 76.66666667
-8.333333333x + x2 = 76.66666667

The x term is -8.333333333x.  Take half its coefficient (-4.166666667).
Square it (17.36111111) and add it to both sides.

Add '17.36111111' to each side of the equation.
-8.333333333x + 17.36111111 + x2 = 76.66666667 + 17.36111111

Reorder the terms:
17.36111111 + -8.333333333x + x2 = 76.66666667 + 17.36111111

Combine like terms: 76.66666667 + 17.36111111 = 94.02777778
17.36111111 + -8.333333333x + x2 = 94.02777778

Factor a perfect square on the left side:
(x + -4.166666667)(x + -4.166666667) = 94.02777778

Calculate the square root of the right side: 9.696792139

Break this problem into two subproblems by setting 
(x + -4.166666667) equal to 9.696792139 and -9.696792139.

Subproblem 1

x + -4.166666667 = 9.696792139 Simplifying x + -4.166666667 = 9.696792139 Reorder the terms: -4.166666667 + x = 9.696792139 Solving -4.166666667 + x = 9.696792139 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4.166666667' to each side of the equation. -4.166666667 + 4.166666667 + x = 9.696792139 + 4.166666667 Combine like terms: -4.166666667 + 4.166666667 = 0.000000000 0.000000000 + x = 9.696792139 + 4.166666667 x = 9.696792139 + 4.166666667 Combine like terms: 9.696792139 + 4.166666667 = 13.863458806 x = 13.863458806 Simplifying x = 13.863458806

Subproblem 2

x + -4.166666667 = -9.696792139 Simplifying x + -4.166666667 = -9.696792139 Reorder the terms: -4.166666667 + x = -9.696792139 Solving -4.166666667 + x = -9.696792139 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4.166666667' to each side of the equation. -4.166666667 + 4.166666667 + x = -9.696792139 + 4.166666667 Combine like terms: -4.166666667 + 4.166666667 = 0.000000000 0.000000000 + x = -9.696792139 + 4.166666667 x = -9.696792139 + 4.166666667 Combine like terms: -9.696792139 + 4.166666667 = -5.530125472 x = -5.530125472 Simplifying x = -5.530125472

Solution

The solution to the problem is based on the solutions from the subproblems. x = {13.863458806, -5.530125472}

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