(2-7i)(7+7i)(3+3i)

solve (2-7i)(7+7i)(3+3i)
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Expand the first two sets of brackets: 14-35i+49=7(9-5i), taking i to mean square root of minus 1. -7i*+7i=-49(-1)=+49. Multiply by 1+i then by 3: 21(14+4i)=21(14+4i)=294+84i or 42(7+2i).

by Top Rated User (1.2m points)
12+3i is as far as i got
by

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