-28=4r^2

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Solution for -28=4r^2 equation: 



-28=4r^2

We move all terms to the left:

-28-(4r^2)=0

a = -4; b = 0; c = -28;
Δ = b2-4ac
Δ = 02-4·(-4)·(-28)
Δ = -448
Delta is less than zero, so there is no solution for the equation

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