(.5x-3)(.5x-7)=120

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Solution for (.5x-3)(.5x-7)=120 equation:


Simplifying
(0.5x + -3)(0.5x + -7) = 120

Reorder the terms:
(-3 + 0.5x)(0.5x + -7) = 120

Reorder the terms:
(-3 + 0.5x)(-7 + 0.5x) = 120

Multiply (-3 + 0.5x) * (-7 + 0.5x)
(-3(-7 + 0.5x) + 0.5x * (-7 + 0.5x)) = 120
((-7 * -3 + 0.5x * -3) + 0.5x * (-7 + 0.5x)) = 120
((21 + -1.5x) + 0.5x * (-7 + 0.5x)) = 120
(21 + -1.5x + (-7 * 0.5x + 0.5x * 0.5x)) = 120
(21 + -1.5x + (-3.5x + 0.25x2)) = 120

Combine like terms: -1.5x + -3.5x = -5x
(21 + -5x + 0.25x2) = 120

Solving
21 + -5x + 0.25x2 = 120

Solving for variable 'x'.

Reorder the terms:
21 + -120 + -5x + 0.25x2 = 120 + -120

Combine like terms: 21 + -120 = -99
-99 + -5x + 0.25x2 = 120 + -120

Combine like terms: 120 + -120 = 0
-99 + -5x + 0.25x2 = 0

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

Divide each side by '0.25'.
-396 + -20x + x2 = 0

Move the constant term to the right:

Add '396' to each side of the equation.
-396 + -20x + 396 + x2 = 0 + 396

Reorder the terms:
-396 + 396 + -20x + x2 = 0 + 396

Combine like terms: -396 + 396 = 0
0 + -20x + x2 = 0 + 396
-20x + x2 = 0 + 396

Combine like terms: 0 + 396 = 396
-20x + x2 = 396

The x term is -20x.  Take half its coefficient (-10).
Square it (100) and add it to both sides.

Add '100' to each side of the equation.
-20x + 100 + x2 = 396 + 100

Reorder the terms:
100 + -20x + x2 = 396 + 100

Combine like terms: 396 + 100 = 496
100 + -20x + x2 = 496

Factor a perfect square on the left side:
(x + -10)(x + -10) = 496

Calculate the square root of the right side: 22.271057451

Break this problem into two subproblems by setting 
(x + -10) equal to 22.271057451 and -22.271057451.

Subproblem 1

x + -10 = 22.271057451 Simplifying x + -10 = 22.271057451 Reorder the terms: -10 + x = 22.271057451 Solving -10 + x = 22.271057451 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '10' to each side of the equation. -10 + 10 + x = 22.271057451 + 10 Combine like terms: -10 + 10 = 0 0 + x = 22.271057451 + 10 x = 22.271057451 + 10 Combine like terms: 22.271057451 + 10 = 32.271057451 x = 32.271057451 Simplifying x = 32.271057451

Subproblem 2

x + -10 = -22.271057451 Simplifying x + -10 = -22.271057451 Reorder the terms: -10 + x = -22.271057451 Solving -10 + x = -22.271057451 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '10' to each side of the equation. -10 + 10 + x = -22.271057451 + 10 Combine like terms: -10 + 10 = 0 0 + x = -22.271057451 + 10 x = -22.271057451 + 10 Combine like terms: -22.271057451 + 10 = -12.271057451 x = -12.271057451 Simplifying x = -12.271057451

Solution

The solution to the problem is based on the solutions from the subproblems. x = {32.271057451, -12.271057451}

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