(s-4)(s-5)=9

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Solution for (s-4)(s-5)=9 equation:


Simplifying
(s + -4)(s + -5) = 9

Reorder the terms:
(-4 + s)(s + -5) = 9

Reorder the terms:
(-4 + s)(-5 + s) = 9

Multiply (-4 + s) * (-5 + s)
(-4(-5 + s) + s(-5 + s)) = 9
((-5 * -4 + s * -4) + s(-5 + s)) = 9
((20 + -4s) + s(-5 + s)) = 9
(20 + -4s + (-5 * s + s * s)) = 9
(20 + -4s + (-5s + s2)) = 9

Combine like terms: -4s + -5s = -9s
(20 + -9s + s2) = 9

Solving
20 + -9s + s2 = 9

Solving for variable 's'.

Reorder the terms:
20 + -9 + -9s + s2 = 9 + -9

Combine like terms: 20 + -9 = 11
11 + -9s + s2 = 9 + -9

Combine like terms: 9 + -9 = 0
11 + -9s + s2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-11' to each side of the equation.
11 + -9s + -11 + s2 = 0 + -11

Reorder the terms:
11 + -11 + -9s + s2 = 0 + -11

Combine like terms: 11 + -11 = 0
0 + -9s + s2 = 0 + -11
-9s + s2 = 0 + -11

Combine like terms: 0 + -11 = -11
-9s + s2 = -11

The s term is -9s.  Take half its coefficient (-4.5).
Square it (20.25) and add it to both sides.

Add '20.25' to each side of the equation.
-9s + 20.25 + s2 = -11 + 20.25

Reorder the terms:
20.25 + -9s + s2 = -11 + 20.25

Combine like terms: -11 + 20.25 = 9.25
20.25 + -9s + s2 = 9.25

Factor a perfect square on the left side:
(s + -4.5)(s + -4.5) = 9.25

Calculate the square root of the right side: 3.041381265

Break this problem into two subproblems by setting 
(s + -4.5) equal to 3.041381265 and -3.041381265.

Subproblem 1

s + -4.5 = 3.041381265 Simplifying s + -4.5 = 3.041381265 Reorder the terms: -4.5 + s = 3.041381265 Solving -4.5 + s = 3.041381265 Solving for variable 's'. Move all terms containing s to the left, all other terms to the right. Add '4.5' to each side of the equation. -4.5 + 4.5 + s = 3.041381265 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + s = 3.041381265 + 4.5 s = 3.041381265 + 4.5 Combine like terms: 3.041381265 + 4.5 = 7.541381265 s = 7.541381265 Simplifying s = 7.541381265

Subproblem 2

s + -4.5 = -3.041381265 Simplifying s + -4.5 = -3.041381265 Reorder the terms: -4.5 + s = -3.041381265 Solving -4.5 + s = -3.041381265 Solving for variable 's'. Move all terms containing s to the left, all other terms to the right. Add '4.5' to each side of the equation. -4.5 + 4.5 + s = -3.041381265 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + s = -3.041381265 + 4.5 s = -3.041381265 + 4.5 Combine like terms: -3.041381265 + 4.5 = 1.458618735 s = 1.458618735 Simplifying s = 1.458618735

Solution

The solution to the problem is based on the solutions from the subproblems. s = {7.541381265, 1.458618735}

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