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What is the standard form of (1 + 7i)(3 − i)? a.(-10 − 10i) b.(-4 − 10i) c.(10 + 20i) d.(20 + 10i) @marie1738
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We need to use the FOIL method. |dw:1457456263202:dw| Also, remember that i * i = i^2 = -1
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