Question

4-36a^6
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Answer 1

$4-36 a^{6} = 2^{2} - 6^{2} * (a^{3} )^{2} = 2^{2} - (6 a^{3}) ^{2} =(2-6 a^{3} )(2+6 a^{3} )=$
$=2*(1-3 a^{3} )*2*(1+3 a^{3} )=4(1-3 a^{3} )(1+3 a^{3} )$