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29 September, 07:36

Simplify the expression (8+i) (2+7i)

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  1. 29 September, 07:51
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    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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