How do you multiply #-7u ^ { 6} ( - 7u ^ { 3} + 9u ^ { 2} + 8u )#?

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Answer 1 · 2017-01-01T15:24:02

#=7u^6(7u^3-9u^2-9u)#

#-7u^6(-7u^3+9u^2+8u)#

#=49u^(3+6)-63u^(2+6)-56u^(1+6#

exponent laws:

#a^m*a^n=a^(m+n)#

#=49u^9-63u^8-56u^7#

Check: find the HCF

#7u^6(7u^3-9u^2-9u)#