m^2-15m+9=0

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Solution for m^2-15m+9=0 equation:


Simplifying
m2 + -15m + 9 = 0

Reorder the terms:
9 + -15m + m2 = 0

Solving
9 + -15m + m2 = 0

Solving for variable 'm'.

Begin completing the square.

Move the constant term to the right:

Add '-9' to each side of the equation.
9 + -15m + -9 + m2 = 0 + -9

Reorder the terms:
9 + -9 + -15m + m2 = 0 + -9

Combine like terms: 9 + -9 = 0
0 + -15m + m2 = 0 + -9
-15m + m2 = 0 + -9

Combine like terms: 0 + -9 = -9
-15m + m2 = -9

The m term is -15m.  Take half its coefficient (-7.5).
Square it (56.25) and add it to both sides.

Add '56.25' to each side of the equation.
-15m + 56.25 + m2 = -9 + 56.25

Reorder the terms:
56.25 + -15m + m2 = -9 + 56.25

Combine like terms: -9 + 56.25 = 47.25
56.25 + -15m + m2 = 47.25

Factor a perfect square on the left side:
(m + -7.5)(m + -7.5) = 47.25

Calculate the square root of the right side: 6.873863542

Break this problem into two subproblems by setting 
(m + -7.5) equal to 6.873863542 and -6.873863542.

Subproblem 1

m + -7.5 = 6.873863542 Simplifying m + -7.5 = 6.873863542 Reorder the terms: -7.5 + m = 6.873863542 Solving -7.5 + m = 6.873863542 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '7.5' to each side of the equation. -7.5 + 7.5 + m = 6.873863542 + 7.5 Combine like terms: -7.5 + 7.5 = 0.0 0.0 + m = 6.873863542 + 7.5 m = 6.873863542 + 7.5 Combine like terms: 6.873863542 + 7.5 = 14.373863542 m = 14.373863542 Simplifying m = 14.373863542

Subproblem 2

m + -7.5 = -6.873863542 Simplifying m + -7.5 = -6.873863542 Reorder the terms: -7.5 + m = -6.873863542 Solving -7.5 + m = -6.873863542 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '7.5' to each side of the equation. -7.5 + 7.5 + m = -6.873863542 + 7.5 Combine like terms: -7.5 + 7.5 = 0.0 0.0 + m = -6.873863542 + 7.5 m = -6.873863542 + 7.5 Combine like terms: -6.873863542 + 7.5 = 0.626136458 m = 0.626136458 Simplifying m = 0.626136458

Solution

The solution to the problem is based on the solutions from the subproblems. m = {14.373863542, 0.626136458}

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