7.65=2.25+.20m(m-1)

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Solution for 7.65=2.25+.20m(m-1) equation:


Simplifying
7.65 = 2.25 + 0.20m(m + -1)

Reorder the terms:
7.65 = 2.25 + 0.20m(-1 + m)
7.65 = 2.25 + (-1 * 0.20m + m * 0.20m)
7.65 = 2.25 + (-0.2m + 0.20m2)

Solving
7.65 = 2.25 + -0.2m + 0.20m2

Solving for variable 'm'.

Combine like terms: 7.65 + -2.25 = 5.4
5.4 + 0.2m + -0.20m2 = 2.25 + -0.2m + 0.20m2 + -2.25 + 0.2m + -0.20m2

Reorder the terms:
5.4 + 0.2m + -0.20m2 = 2.25 + -2.25 + -0.2m + 0.2m + 0.20m2 + -0.20m2

Combine like terms: 2.25 + -2.25 = 0.00
5.4 + 0.2m + -0.20m2 = 0.00 + -0.2m + 0.2m + 0.20m2 + -0.20m2
5.4 + 0.2m + -0.20m2 = -0.2m + 0.2m + 0.20m2 + -0.20m2

Combine like terms: -0.2m + 0.2m = 0.0
5.4 + 0.2m + -0.20m2 = 0.0 + 0.20m2 + -0.20m2
5.4 + 0.2m + -0.20m2 = 0.20m2 + -0.20m2

Combine like terms: 0.20m2 + -0.20m2 = 0.00
5.4 + 0.2m + -0.20m2 = 0.00

Begin completing the square.  Divide all terms by
-0.20 the coefficient of the squared term: 

Divide each side by '-0.20'.
-27 + -1m + m2 = 0

Move the constant term to the right:

Add '27' to each side of the equation.
-27 + -1m + 27 + m2 = 0 + 27

Reorder the terms:
-27 + 27 + -1m + m2 = 0 + 27

Combine like terms: -27 + 27 = 0
0 + -1m + m2 = 0 + 27
-1m + m2 = 0 + 27

Combine like terms: 0 + 27 = 27
-1m + m2 = 27

The m term is -1m.  Take half its coefficient (-0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
-1m + 0.25 + m2 = 27 + 0.25

Reorder the terms:
0.25 + -1m + m2 = 27 + 0.25

Combine like terms: 27 + 0.25 = 27.25
0.25 + -1m + m2 = 27.25

Factor a perfect square on the left side:
(m + -0.5)(m + -0.5) = 27.25

Calculate the square root of the right side: 5.220153254

Break this problem into two subproblems by setting 
(m + -0.5) equal to 5.220153254 and -5.220153254.

Subproblem 1

m + -0.5 = 5.220153254 Simplifying m + -0.5 = 5.220153254 Reorder the terms: -0.5 + m = 5.220153254 Solving -0.5 + m = 5.220153254 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + m = 5.220153254 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + m = 5.220153254 + 0.5 m = 5.220153254 + 0.5 Combine like terms: 5.220153254 + 0.5 = 5.720153254 m = 5.720153254 Simplifying m = 5.720153254

Subproblem 2

m + -0.5 = -5.220153254 Simplifying m + -0.5 = -5.220153254 Reorder the terms: -0.5 + m = -5.220153254 Solving -0.5 + m = -5.220153254 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + m = -5.220153254 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + m = -5.220153254 + 0.5 m = -5.220153254 + 0.5 Combine like terms: -5.220153254 + 0.5 = -4.720153254 m = -4.720153254 Simplifying m = -4.720153254

Solution

The solution to the problem is based on the solutions from the subproblems. m = {5.720153254, -4.720153254}

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