How do you multiply #8a ^ { 9} ( 5a + 10a ^ { 6} + 4)#?

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Answer 1 · 2017-01-02T11:11:12

#80a^15+40a^10+32a^9#

#8a^9(5a+10a^6+4)#

multiply #8a^9# with 5a

multiply #8a^9# with #10a^6#

multiply #8a^9# with 4

remember #a^3*a^4=a^(3+4)=a^7#

#=40a^10+80a^15+32a^9#

#=80a^15+40a^10+32a^9#