m^2-8m=-20

Solution for m^2-8m=-20 equation:

Simplifying
m2 + -8m = -20

Reorder the terms:
-8m + m2 = -20

Solving
-8m + m2 = -20

Solving for variable 'm'.

Reorder the terms:
20 + -8m + m2 = -20 + 20

Combine like terms: -20 + 20 = 0
20 + -8m + m2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-20' to each side of the equation.
20 + -8m + -20 + m2 = 0 + -20

Reorder the terms:
20 + -20 + -8m + m2 = 0 + -20

Combine like terms: 20 + -20 = 0
0 + -8m + m2 = 0 + -20
-8m + m2 = 0 + -20

Combine like terms: 0 + -20 = -20
-8m + m2 = -20

The m term is -8m.  Take half its coefficient (-4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
-8m + 16 + m2 = -20 + 16

Reorder the terms:
16 + -8m + m2 = -20 + 16

Combine like terms: -20 + 16 = -4
16 + -8m + m2 = -4

Factor a perfect square on the left side:
(m + -4)(m + -4) = -4

Can't calculate square root of the right side.

The solution to this equation could not be determined.