(7x-10)(3x+40)=180

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Solution for (7x-10)(3x+40)=180 equation:


Simplifying
(7x + -10)(3x + 40) = 180

Reorder the terms:
(-10 + 7x)(3x + 40) = 180

Reorder the terms:
(-10 + 7x)(40 + 3x) = 180

Multiply (-10 + 7x) * (40 + 3x)
(-10(40 + 3x) + 7x * (40 + 3x)) = 180
((40 * -10 + 3x * -10) + 7x * (40 + 3x)) = 180
((-400 + -30x) + 7x * (40 + 3x)) = 180
(-400 + -30x + (40 * 7x + 3x * 7x)) = 180
(-400 + -30x + (280x + 21x2)) = 180

Combine like terms: -30x + 280x = 250x
(-400 + 250x + 21x2) = 180

Solving
-400 + 250x + 21x2 = 180

Solving for variable 'x'.

Reorder the terms:
-400 + -180 + 250x + 21x2 = 180 + -180

Combine like terms: -400 + -180 = -580
-580 + 250x + 21x2 = 180 + -180

Combine like terms: 180 + -180 = 0
-580 + 250x + 21x2 = 0

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

Divide each side by '21'.
-27.61904762 + 11.9047619x + x2 = 0

Move the constant term to the right:

Add '27.61904762' to each side of the equation.
-27.61904762 + 11.9047619x + 27.61904762 + x2 = 0 + 27.61904762

Reorder the terms:
-27.61904762 + 27.61904762 + 11.9047619x + x2 = 0 + 27.61904762

Combine like terms: -27.61904762 + 27.61904762 = 0.00000000
0.00000000 + 11.9047619x + x2 = 0 + 27.61904762
11.9047619x + x2 = 0 + 27.61904762

Combine like terms: 0 + 27.61904762 = 27.61904762
11.9047619x + x2 = 27.61904762

The x term is 11.9047619x.  Take half its coefficient (5.95238095).
Square it (35.43083897) and add it to both sides.

Add '35.43083897' to each side of the equation.
11.9047619x + 35.43083897 + x2 = 27.61904762 + 35.43083897

Reorder the terms:
35.43083897 + 11.9047619x + x2 = 27.61904762 + 35.43083897

Combine like terms: 27.61904762 + 35.43083897 = 63.04988659
35.43083897 + 11.9047619x + x2 = 63.04988659

Factor a perfect square on the left side:
(x + 5.95238095)(x + 5.95238095) = 63.04988659

Calculate the square root of the right side: 7.940395871

Break this problem into two subproblems by setting 
(x + 5.95238095) equal to 7.940395871 and -7.940395871.

Subproblem 1

x + 5.95238095 = 7.940395871 Simplifying x + 5.95238095 = 7.940395871 Reorder the terms: 5.95238095 + x = 7.940395871 Solving 5.95238095 + x = 7.940395871 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5.95238095' to each side of the equation. 5.95238095 + -5.95238095 + x = 7.940395871 + -5.95238095 Combine like terms: 5.95238095 + -5.95238095 = 0.00000000 0.00000000 + x = 7.940395871 + -5.95238095 x = 7.940395871 + -5.95238095 Combine like terms: 7.940395871 + -5.95238095 = 1.988014921 x = 1.988014921 Simplifying x = 1.988014921

Subproblem 2

x + 5.95238095 = -7.940395871 Simplifying x + 5.95238095 = -7.940395871 Reorder the terms: 5.95238095 + x = -7.940395871 Solving 5.95238095 + x = -7.940395871 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5.95238095' to each side of the equation. 5.95238095 + -5.95238095 + x = -7.940395871 + -5.95238095 Combine like terms: 5.95238095 + -5.95238095 = 0.00000000 0.00000000 + x = -7.940395871 + -5.95238095 x = -7.940395871 + -5.95238095 Combine like terms: -7.940395871 + -5.95238095 = -13.892776821 x = -13.892776821 Simplifying x = -13.892776821

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.988014921, -13.892776821}

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