(x-3)(x-5)=9

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Solution for (x-3)(x-5)=9 equation:


Simplifying
(x + -3)(x + -5) = 9

Reorder the terms:
(-3 + x)(x + -5) = 9

Reorder the terms:
(-3 + x)(-5 + x) = 9

Multiply (-3 + x) * (-5 + x)
(-3(-5 + x) + x(-5 + x)) = 9
((-5 * -3 + x * -3) + x(-5 + x)) = 9
((15 + -3x) + x(-5 + x)) = 9
(15 + -3x + (-5 * x + x * x)) = 9
(15 + -3x + (-5x + x2)) = 9

Combine like terms: -3x + -5x = -8x
(15 + -8x + x2) = 9

Solving
15 + -8x + x2 = 9

Solving for variable 'x'.

Reorder the terms:
15 + -9 + -8x + x2 = 9 + -9

Combine like terms: 15 + -9 = 6
6 + -8x + x2 = 9 + -9

Combine like terms: 9 + -9 = 0
6 + -8x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-6' to each side of the equation.
6 + -8x + -6 + x2 = 0 + -6

Reorder the terms:
6 + -6 + -8x + x2 = 0 + -6

Combine like terms: 6 + -6 = 0
0 + -8x + x2 = 0 + -6
-8x + x2 = 0 + -6

Combine like terms: 0 + -6 = -6
-8x + x2 = -6

The x term is -8x.  Take half its coefficient (-4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
-8x + 16 + x2 = -6 + 16

Reorder the terms:
16 + -8x + x2 = -6 + 16

Combine like terms: -6 + 16 = 10
16 + -8x + x2 = 10

Factor a perfect square on the left side:
(x + -4)(x + -4) = 10

Calculate the square root of the right side: 3.16227766

Break this problem into two subproblems by setting 
(x + -4) equal to 3.16227766 and -3.16227766.

Subproblem 1

x + -4 = 3.16227766 Simplifying x + -4 = 3.16227766 Reorder the terms: -4 + x = 3.16227766 Solving -4 + x = 3.16227766 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + x = 3.16227766 + 4 Combine like terms: -4 + 4 = 0 0 + x = 3.16227766 + 4 x = 3.16227766 + 4 Combine like terms: 3.16227766 + 4 = 7.16227766 x = 7.16227766 Simplifying x = 7.16227766

Subproblem 2

x + -4 = -3.16227766 Simplifying x + -4 = -3.16227766 Reorder the terms: -4 + x = -3.16227766 Solving -4 + x = -3.16227766 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + x = -3.16227766 + 4 Combine like terms: -4 + 4 = 0 0 + x = -3.16227766 + 4 x = -3.16227766 + 4 Combine like terms: -3.16227766 + 4 = 0.83772234 x = 0.83772234 Simplifying x = 0.83772234

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.16227766, 0.83772234}

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