Question

Which expression demonstrates the use of the commutative property of addition in the first step of simplifying the expression (–1 + i) + (21 + 5i)?
(–1 + i) + (21 + 5i) + 0
–1 + (i + 21) + 5i
(–1 + 21) + (i + 5i)
–(1 – i) + (21 + 5i)

Answer 1

thoughts?

recall that the commutative property lets you move the terms around in addition (not the parentheses), ex: a + b = b + a

with that in mind, which one do you think best demonstrates this idea?