Question

(a4-2b3)2=(  )+2(  ).(  )+(  )=

Answer 1

(a4-2b3)2=( a^4 )²+2(a^4 ).(2b³ )+(2b³ )²= a^8 + 4b³a^4 + 4b^6

Answer 2

$= (a^{4}-2b^{3})^{2} \\ \\ =(a^{4})^{2}+2(a^{4}).(2b^{3})-(2b^{3})^{2} \\ \\ =a^{8}+2.a^{4}.2b^{3}-2^{2}.b^{6} \\ \\ =a^{8}+4a^{4}b^{3}-4b^{6}$