If you remember that the square of *i* is –1, you can reduce these to purely real numbers before you even FOIL.

In *a* + *bi* form, 5 is just 5 + 0*i*, so *a* + *b* will be 5 + 0 = 5.

from Tumblr https://ift.tt/2A7wbcj

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If you remember that the square of *i* is –1, you can reduce these to purely real numbers before you even FOIL.

In *a* + *bi* form, 5 is just 5 + 0*i*, so *a* + *b* will be 5 + 0 = 5.

from Tumblr https://ift.tt/2A7wbcj