Answer
e=4 cm
Work Step by Step
V=e$^3$
e$^3$+61=(e+1)$^3$
e$^3$+61=(e$^2$+2e+1)(e+1)
e$^3$+61=e$^3$+e$^2$+2e$^2$+2e+e+1
3e$^2$+3e-60=0
e$^2$+e-20=0
(e+5)(e-4)=0
e=4
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