How do you simplify #2x ( - 3) ^ { 2} - 81\div 2#?

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Answer 1 · 2016-11-13T10:43:12

#18x-40 1/2" OR " -22 1/2#

There are 2 terms - work out each separately and then add or subtract in the last line.

#2x(-3)^2 -81 div2#

=#2x xx9 - 40 1/2#

=#18x-40 1/2" "larr# unlike terms

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However, I suspect that the first term should actually have been:

#2 xx (-3)^2 -81 div 2#

=#2 xx9 - 40 1/2#

=#18 -40 1/2#

=# -22 1/2#