(x+4)(140-x)=150

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Solution for (x+4)(140-x)=150 equation:


Simplifying
(x + 4)(140 + -1x) = 150

Reorder the terms:
(4 + x)(140 + -1x) = 150

Multiply (4 + x) * (140 + -1x)
(4(140 + -1x) + x(140 + -1x)) = 150
((140 * 4 + -1x * 4) + x(140 + -1x)) = 150
((560 + -4x) + x(140 + -1x)) = 150
(560 + -4x + (140 * x + -1x * x)) = 150
(560 + -4x + (140x + -1x2)) = 150

Combine like terms: -4x + 140x = 136x
(560 + 136x + -1x2) = 150

Solving
560 + 136x + -1x2 = 150

Solving for variable 'x'.

Reorder the terms:
560 + -150 + 136x + -1x2 = 150 + -150

Combine like terms: 560 + -150 = 410
410 + 136x + -1x2 = 150 + -150

Combine like terms: 150 + -150 = 0
410 + 136x + -1x2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-410 + -136x + x2 = 0

Move the constant term to the right:

Add '410' to each side of the equation.
-410 + -136x + 410 + x2 = 0 + 410

Reorder the terms:
-410 + 410 + -136x + x2 = 0 + 410

Combine like terms: -410 + 410 = 0
0 + -136x + x2 = 0 + 410
-136x + x2 = 0 + 410

Combine like terms: 0 + 410 = 410
-136x + x2 = 410

The x term is -136x.  Take half its coefficient (-68).
Square it (4624) and add it to both sides.

Add '4624' to each side of the equation.
-136x + 4624 + x2 = 410 + 4624

Reorder the terms:
4624 + -136x + x2 = 410 + 4624

Combine like terms: 410 + 4624 = 5034
4624 + -136x + x2 = 5034

Factor a perfect square on the left side:
(x + -68)(x + -68) = 5034

Calculate the square root of the right side: 70.9506871

Break this problem into two subproblems by setting 
(x + -68) equal to 70.9506871 and -70.9506871.

Subproblem 1

x + -68 = 70.9506871 Simplifying x + -68 = 70.9506871 Reorder the terms: -68 + x = 70.9506871 Solving -68 + x = 70.9506871 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '68' to each side of the equation. -68 + 68 + x = 70.9506871 + 68 Combine like terms: -68 + 68 = 0 0 + x = 70.9506871 + 68 x = 70.9506871 + 68 Combine like terms: 70.9506871 + 68 = 138.9506871 x = 138.9506871 Simplifying x = 138.9506871

Subproblem 2

x + -68 = -70.9506871 Simplifying x + -68 = -70.9506871 Reorder the terms: -68 + x = -70.9506871 Solving -68 + x = -70.9506871 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '68' to each side of the equation. -68 + 68 + x = -70.9506871 + 68 Combine like terms: -68 + 68 = 0 0 + x = -70.9506871 + 68 x = -70.9506871 + 68 Combine like terms: -70.9506871 + 68 = -2.9506871 x = -2.9506871 Simplifying x = -2.9506871

Solution

The solution to the problem is based on the solutions from the subproblems. x = {138.9506871, -2.9506871}

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