243a^5 -a^3 factor it
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243(a^5) - (a^3)
(a^3) [243(a^2) - 1 ]. taking (a^3) common
putting this equal to 0
we get a=0
or a = 1 / (√243)
(a^3) [243(a^2) - 1 ]. taking (a^3) common
putting this equal to 0
we get a=0
or a = 1 / (√243)
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