Factorise :-}
2a^5-54a^2
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2a^5-54a^2=0
2a^2(a^3-27)=0
by comparing
2a^2=0. a^3-27=0
a=0. a^3=27
a=3,a=-3
2a^2(a^3-27)=0
by comparing
2a^2=0. a^3-27=0
a=0. a^3=27
a=3,a=-3
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