Simplify (9.0×10^9)[20×10^-8/d+0.1)-5.0×10^-8/d^2)=0
9x109(20x10−8d−5x10−8d2)=09x10^9(\frac{20x10^{-8}}{d}-\frac{5x10^{-8}}{d^2)}=09x109(d20x10−8−d2)5x10−8=0
9x109(20x10−8d−5x10−8d2)=09x10^9(\frac{20x10^{-8}d-5x10^{-8}}{d^2})=09x109(d220x10−8d−5x10−8)=0
9x109(5x10−8(4d−1)d2)=09x10^9(\frac{5x10^{-8}(4d-1)}{d^2})=09x109(d25x10−8(4d−1))=0
(450(4d−1)d2)=0(\frac{450(4d-1)}{d^2})=0(d2450(4d−1))=0
4d−1=04d-1=04d−1=0
d=0.25
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