r^2-4r+8=5r

Solution for r^2-4r+8=5r equation:

Simplifying
r2 + -4r + 8 = 5r

Reorder the terms:
8 + -4r + r2 = 5r

Solving
8 + -4r + r2 = 5r

Solving for variable 'r'.

Reorder the terms:
8 + -4r + -5r + r2 = 5r + -5r

Combine like terms: -4r + -5r = -9r
8 + -9r + r2 = 5r + -5r

Combine like terms: 5r + -5r = 0
8 + -9r + r2 = 0

Factor a trinomial.
(1 + -1r)(8 + -1r) = 0

Subproblem 1
Set the factor '(1 + -1r)' equal to zero and attempt to solve:

Simplifying
1 + -1r = 0

Solving
1 + -1r = 0

Move all terms containing r to the left, all other terms to the right.

Add '-1' to each side of the equation.
1 + -1 + -1r = 0 + -1

Combine like terms: 1 + -1 = 0
0 + -1r = 0 + -1
-1r = 0 + -1

Combine like terms: 0 + -1 = -1
-1r = -1

Divide each side by '-1'.
r = 1

Simplifying
r = 1
Subproblem 2
Set the factor '(8 + -1r)' equal to zero and attempt to solve:

Simplifying
8 + -1r = 0

Solving
8 + -1r = 0

Move all terms containing r to the left, all other terms to the right.

Add '-8' to each side of the equation.
8 + -8 + -1r = 0 + -8

Combine like terms: 8 + -8 = 0
0 + -1r = 0 + -8
-1r = 0 + -8

Combine like terms: 0 + -8 = -8
-1r = -8

Divide each side by '-1'.
r = 8

Simplifying
r = 8
Solution
r = {1, 8}