How do you combine #9x ^ { 3} - x ^ { 2} + 5x - 4- 2x ^ { 3} + 8x ^ { 2} - 6x + 6#?

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Answer 1 · 2018-05-03T13:50:05

#=> 7x^3+7x^2-x+2#

Collect like terms

#9x^3-x^2+5x-4-2x^3+8x^2-6x+6#

add/subtract terms that have the same powers
#9x^3-2x^3=7x^3#

#8x^2-x^2=7x^2#

#5x-6x=-x#

#6-4=2#

then put them all together

#=> 7x^3+7x^2-x+2#