How do you combine like terms in #(1.6x ^ { 3} - 3.6x + 7.2) + ( 6.3x ^ { 3} + 4.3x ^ { 2} - 9.2)#?

1 Answer
Tony B
Jun 18, 2017

#7.9x^3+4.3x^2-3.6x-2 #

Explanation:

Note that I use the place keepers #0x^2 and 0x#. These have no value

If selecting and processing horizontally gives you a problem (better if you can do it) then use this method.

#1.6x^3+0x^2 -3.6x+7.2#
#ul(6.3x^3+4.3x^2+0x-9.2) larr" Add#
#7.9x^3+4.3x^2-3.6x-2 #

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