What is the sum of x³ + 5x²-7 and
5x²-3x²+2x-1?
Danielle’s Work:
(x³ + 5x² – 7) + (5x³ – 3x² + 2x – 1)
x³ + 5x³+5x²-3x²+2x-7-1
6x + 2x + 2x-8
Danielle’s Mistake:
Correct Work:
What should she do in the future to
prevent this error?