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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)
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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?
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