(3x-10)(x+40)=180

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Solution for (3x-10)(x+40)=180 equation:


Simplifying
(3x + -10)(x + 40) = 180

Reorder the terms:
(-10 + 3x)(x + 40) = 180

Reorder the terms:
(-10 + 3x)(40 + x) = 180

Multiply (-10 + 3x) * (40 + x)
(-10(40 + x) + 3x * (40 + x)) = 180
((40 * -10 + x * -10) + 3x * (40 + x)) = 180
((-400 + -10x) + 3x * (40 + x)) = 180
(-400 + -10x + (40 * 3x + x * 3x)) = 180
(-400 + -10x + (120x + 3x2)) = 180

Combine like terms: -10x + 120x = 110x
(-400 + 110x + 3x2) = 180

Solving
-400 + 110x + 3x2 = 180

Solving for variable 'x'.

Reorder the terms:
-400 + -180 + 110x + 3x2 = 180 + -180

Combine like terms: -400 + -180 = -580
-580 + 110x + 3x2 = 180 + -180

Combine like terms: 180 + -180 = 0
-580 + 110x + 3x2 = 0

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

Divide each side by '3'.
-193.3333333 + 36.66666667x + x2 = 0

Move the constant term to the right:

Add '193.3333333' to each side of the equation.
-193.3333333 + 36.66666667x + 193.3333333 + x2 = 0 + 193.3333333

Reorder the terms:
-193.3333333 + 193.3333333 + 36.66666667x + x2 = 0 + 193.3333333

Combine like terms: -193.3333333 + 193.3333333 = 0.0000000
0.0000000 + 36.66666667x + x2 = 0 + 193.3333333
36.66666667x + x2 = 0 + 193.3333333

Combine like terms: 0 + 193.3333333 = 193.3333333
36.66666667x + x2 = 193.3333333

The x term is 36.66666667x.  Take half its coefficient (18.33333334).
Square it (336.1111114) and add it to both sides.

Add '336.1111114' to each side of the equation.
36.66666667x + 336.1111114 + x2 = 193.3333333 + 336.1111114

Reorder the terms:
336.1111114 + 36.66666667x + x2 = 193.3333333 + 336.1111114

Combine like terms: 193.3333333 + 336.1111114 = 529.4444447
336.1111114 + 36.66666667x + x2 = 529.4444447

Factor a perfect square on the left side:
(x + 18.33333334)(x + 18.33333334) = 529.4444447

Calculate the square root of the right side: 23.009659813

Break this problem into two subproblems by setting 
(x + 18.33333334) equal to 23.009659813 and -23.009659813.

Subproblem 1

x + 18.33333334 = 23.009659813 Simplifying x + 18.33333334 = 23.009659813 Reorder the terms: 18.33333334 + x = 23.009659813 Solving 18.33333334 + x = 23.009659813 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-18.33333334' to each side of the equation. 18.33333334 + -18.33333334 + x = 23.009659813 + -18.33333334 Combine like terms: 18.33333334 + -18.33333334 = 0.00000000 0.00000000 + x = 23.009659813 + -18.33333334 x = 23.009659813 + -18.33333334 Combine like terms: 23.009659813 + -18.33333334 = 4.676326473 x = 4.676326473 Simplifying x = 4.676326473

Subproblem 2

x + 18.33333334 = -23.009659813 Simplifying x + 18.33333334 = -23.009659813 Reorder the terms: 18.33333334 + x = -23.009659813 Solving 18.33333334 + x = -23.009659813 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-18.33333334' to each side of the equation. 18.33333334 + -18.33333334 + x = -23.009659813 + -18.33333334 Combine like terms: 18.33333334 + -18.33333334 = 0.00000000 0.00000000 + x = -23.009659813 + -18.33333334 x = -23.009659813 + -18.33333334 Combine like terms: -23.009659813 + -18.33333334 = -41.342993153 x = -41.342993153 Simplifying x = -41.342993153

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.676326473, -41.342993153}

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