.5(4r^2-10r)-r+5=

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Solution for .5(4r^2-10r)-r+5= equation:


Simplifying
0.5(4r2 + -10r) + -1r + 5 = 0

Reorder the terms:
0.5(-10r + 4r2) + -1r + 5 = 0
(-10r * 0.5 + 4r2 * 0.5) + -1r + 5 = 0
(-5r + 2r2) + -1r + 5 = 0

Reorder the terms:
5 + -5r + -1r + 2r2 = 0

Combine like terms: -5r + -1r = -6r
5 + -6r + 2r2 = 0

Solving
5 + -6r + 2r2 = 0

Solving for variable 'r'.

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

Divide each side by '2'.
2.5 + -3r + r2 = 0

Move the constant term to the right:

Add '-2.5' to each side of the equation.
2.5 + -3r + -2.5 + r2 = 0 + -2.5

Reorder the terms:
2.5 + -2.5 + -3r + r2 = 0 + -2.5

Combine like terms: 2.5 + -2.5 = 0.0
0.0 + -3r + r2 = 0 + -2.5
-3r + r2 = 0 + -2.5

Combine like terms: 0 + -2.5 = -2.5
-3r + r2 = -2.5

The r term is -3r.  Take half its coefficient (-1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
-3r + 2.25 + r2 = -2.5 + 2.25

Reorder the terms:
2.25 + -3r + r2 = -2.5 + 2.25

Combine like terms: -2.5 + 2.25 = -0.25
2.25 + -3r + r2 = -0.25

Factor a perfect square on the left side:
(r + -1.5)(r + -1.5) = -0.25

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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