5r^2-2r+5=0

Solution for 5r^2-2r+5=0 equation:

Simplifying
5r2 + -2r + 5 = 0

Reorder the terms:
5 + -2r + 5r2 = 0

Solving
5 + -2r + 5r2 = 0

Solving for variable 'r'.

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

Divide each side by '5'.
1 + -0.4r + r2 = 0

Move the constant term to the right:

Add '-1' to each side of the equation.
1 + -0.4r + -1 + r2 = 0 + -1

Reorder the terms:
1 + -1 + -0.4r + r2 = 0 + -1

Combine like terms: 1 + -1 = 0
0 + -0.4r + r2 = 0 + -1
-0.4r + r2 = 0 + -1

Combine like terms: 0 + -1 = -1
-0.4r + r2 = -1

The r term is -0.4r.  Take half its coefficient (-0.2).
Square it (0.04) and add it to both sides.

Add '0.04' to each side of the equation.
-0.4r + 0.04 + r2 = -1 + 0.04

Reorder the terms:
0.04 + -0.4r + r2 = -1 + 0.04

Combine like terms: -1 + 0.04 = -0.96
0.04 + -0.4r + r2 = -0.96

Factor a perfect square on the left side:
(r + -0.2)(r + -0.2) = -0.96

Can't calculate square root of the right side.

The solution to this equation could not be determined.