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  • 26-11-2018
  • Mathematics
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simplify the expression (8+i)(2+7i)

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Rinkhals
Rinkhals Rinkhals
  • 26-11-2018

Given : (8 + i)(2 + 7i)

⇒ (8 × 2) + (8 × 7i) + (i × 2) + (i × 7i)

⇒ 16 + 56i + 2i + 7i²

We know that i² = -1

⇒ 16 + 58i + 7(-1)

⇒ 16 + 58i - 7

⇒ 9 + 58i

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