7=m^2-4m

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Solution for 7=m^2-4m equation:


Simplifying
7 = m2 + -4m

Reorder the terms:
7 = -4m + m2

Solving
7 = -4m + m2

Solving for variable 'm'.

Reorder the terms:
7 + 4m + -1m2 = -4m + 4m + m2 + -1m2

Combine like terms: -4m + 4m = 0
7 + 4m + -1m2 = 0 + m2 + -1m2
7 + 4m + -1m2 = m2 + -1m2

Combine like terms: m2 + -1m2 = 0
7 + 4m + -1m2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-7 + -4m + m2 = 0

Move the constant term to the right:

Add '7' to each side of the equation.
-7 + -4m + 7 + m2 = 0 + 7

Reorder the terms:
-7 + 7 + -4m + m2 = 0 + 7

Combine like terms: -7 + 7 = 0
0 + -4m + m2 = 0 + 7
-4m + m2 = 0 + 7

Combine like terms: 0 + 7 = 7
-4m + m2 = 7

The m term is -4m.  Take half its coefficient (-2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
-4m + 4 + m2 = 7 + 4

Reorder the terms:
4 + -4m + m2 = 7 + 4

Combine like terms: 7 + 4 = 11
4 + -4m + m2 = 11

Factor a perfect square on the left side:
(m + -2)(m + -2) = 11

Calculate the square root of the right side: 3.31662479

Break this problem into two subproblems by setting 
(m + -2) equal to 3.31662479 and -3.31662479.

Subproblem 1

m + -2 = 3.31662479 Simplifying m + -2 = 3.31662479 Reorder the terms: -2 + m = 3.31662479 Solving -2 + m = 3.31662479 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + m = 3.31662479 + 2 Combine like terms: -2 + 2 = 0 0 + m = 3.31662479 + 2 m = 3.31662479 + 2 Combine like terms: 3.31662479 + 2 = 5.31662479 m = 5.31662479 Simplifying m = 5.31662479

Subproblem 2

m + -2 = -3.31662479 Simplifying m + -2 = -3.31662479 Reorder the terms: -2 + m = -3.31662479 Solving -2 + m = -3.31662479 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + m = -3.31662479 + 2 Combine like terms: -2 + 2 = 0 0 + m = -3.31662479 + 2 m = -3.31662479 + 2 Combine like terms: -3.31662479 + 2 = -1.31662479 m = -1.31662479 Simplifying m = -1.31662479

Solution

The solution to the problem is based on the solutions from the subproblems. m = {5.31662479, -1.31662479}

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