s(s-9)=-15

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Solution for s(s-9)=-15 equation:


Simplifying
s(s + -9) = -15

Reorder the terms:
s(-9 + s) = -15
(-9 * s + s * s) = -15
(-9s + s2) = -15

Solving
-9s + s2 = -15

Solving for variable 's'.

Reorder the terms:
15 + -9s + s2 = -15 + 15

Combine like terms: -15 + 15 = 0
15 + -9s + s2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-15' to each side of the equation.
15 + -9s + -15 + s2 = 0 + -15

Reorder the terms:
15 + -15 + -9s + s2 = 0 + -15

Combine like terms: 15 + -15 = 0
0 + -9s + s2 = 0 + -15
-9s + s2 = 0 + -15

Combine like terms: 0 + -15 = -15
-9s + s2 = -15

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 = -15 + 20.25

Reorder the terms:
20.25 + -9s + s2 = -15 + 20.25

Combine like terms: -15 + 20.25 = 5.25
20.25 + -9s + s2 = 5.25

Factor a perfect square on the left side:
(s + -4.5)(s + -4.5) = 5.25

Calculate the square root of the right side: 2.291287847

Break this problem into two subproblems by setting 
(s + -4.5) equal to 2.291287847 and -2.291287847.

Subproblem 1

s + -4.5 = 2.291287847 Simplifying s + -4.5 = 2.291287847 Reorder the terms: -4.5 + s = 2.291287847 Solving -4.5 + s = 2.291287847 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 = 2.291287847 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + s = 2.291287847 + 4.5 s = 2.291287847 + 4.5 Combine like terms: 2.291287847 + 4.5 = 6.791287847 s = 6.791287847 Simplifying s = 6.791287847

Subproblem 2

s + -4.5 = -2.291287847 Simplifying s + -4.5 = -2.291287847 Reorder the terms: -4.5 + s = -2.291287847 Solving -4.5 + s = -2.291287847 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 = -2.291287847 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + s = -2.291287847 + 4.5 s = -2.291287847 + 4.5 Combine like terms: -2.291287847 + 4.5 = 2.208712153 s = 2.208712153 Simplifying s = 2.208712153

Solution

The solution to the problem is based on the solutions from the subproblems. s = {6.791287847, 2.208712153}

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