(5-x)(7-x)=72

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Solution for (5-x)(7-x)=72 equation:


Simplifying
(5 + -1x)(7 + -1x) = 72

Multiply (5 + -1x) * (7 + -1x)
(5(7 + -1x) + -1x * (7 + -1x)) = 72
((7 * 5 + -1x * 5) + -1x * (7 + -1x)) = 72
((35 + -5x) + -1x * (7 + -1x)) = 72
(35 + -5x + (7 * -1x + -1x * -1x)) = 72
(35 + -5x + (-7x + 1x2)) = 72

Combine like terms: -5x + -7x = -12x
(35 + -12x + 1x2) = 72

Solving
35 + -12x + 1x2 = 72

Solving for variable 'x'.

Reorder the terms:
35 + -72 + -12x + 1x2 = 72 + -72

Combine like terms: 35 + -72 = -37
-37 + -12x + 1x2 = 72 + -72

Combine like terms: 72 + -72 = 0
-37 + -12x + 1x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '37' to each side of the equation.
-37 + -12x + 37 + x2 = 0 + 37

Reorder the terms:
-37 + 37 + -12x + x2 = 0 + 37

Combine like terms: -37 + 37 = 0
0 + -12x + x2 = 0 + 37
-12x + x2 = 0 + 37

Combine like terms: 0 + 37 = 37
-12x + x2 = 37

The x term is -12x.  Take half its coefficient (-6).
Square it (36) and add it to both sides.

Add '36' to each side of the equation.
-12x + 36 + x2 = 37 + 36

Reorder the terms:
36 + -12x + x2 = 37 + 36

Combine like terms: 37 + 36 = 73
36 + -12x + x2 = 73

Factor a perfect square on the left side:
(x + -6)(x + -6) = 73

Calculate the square root of the right side: 8.544003745

Break this problem into two subproblems by setting 
(x + -6) equal to 8.544003745 and -8.544003745.

Subproblem 1

x + -6 = 8.544003745 Simplifying x + -6 = 8.544003745 Reorder the terms: -6 + x = 8.544003745 Solving -6 + x = 8.544003745 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + x = 8.544003745 + 6 Combine like terms: -6 + 6 = 0 0 + x = 8.544003745 + 6 x = 8.544003745 + 6 Combine like terms: 8.544003745 + 6 = 14.544003745 x = 14.544003745 Simplifying x = 14.544003745

Subproblem 2

x + -6 = -8.544003745 Simplifying x + -6 = -8.544003745 Reorder the terms: -6 + x = -8.544003745 Solving -6 + x = -8.544003745 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + x = -8.544003745 + 6 Combine like terms: -6 + 6 = 0 0 + x = -8.544003745 + 6 x = -8.544003745 + 6 Combine like terms: -8.544003745 + 6 = -2.544003745 x = -2.544003745 Simplifying x = -2.544003745

Solution

The solution to the problem is based on the solutions from the subproblems. x = {14.544003745, -2.544003745}

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