Find the product of (3 + 7i)(1 − i), and write the answer in standard form.
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(3 + 7i)(1 − i)
==> 3*1 - 3*i + 7i*1 - 7i*i
==> 3 - 3i + 7i - 7i^2
===> -7i^2+4i+3
==> -7i^2+7i - 3i + 3
==> -7i(i-1) - 3(i-1)
==> (i-1) (-7i-3)
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