Multiply r^2-4r=0

Math
r2-4r=0
Factor r out of r2-4r.
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Factor r out of r2.
r⋅r-4r=0
Factor r out of -4r.
r⋅r+r⋅-4=0
Factor r out of r⋅r+r⋅-4.
r(r-4)=0
r(r-4)=0
If any individual factor on the left side of the equation is equal to 0, the entire expression will be equal to 0.
r=0
r-4=0
Set the first factor equal to 0.
r=0
Set the next factor equal to 0 and solve.
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Set the next factor equal to 0.
r-4=0
Add 4 to both sides of the equation.
r=4
r=4
The final solution is all the values that make r(r-4)=0 true.
r=0,4
Multiply r^2-4r=0

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