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22 January, 01:25

Find a ⋅ b. a = 10i + 9j, b = 4i + 3j

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  1. 22 January, 01:41
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    (10i+9j) • (4i+3j) = x

    10i • 4i = 40i²

    10i • 3j = 30ij

    9j • 4i = 36ij

    9j • 3j = 27j²

    then combine the common numbers

    x = 40i² + 27j² + 66ij

    hope you were looking for it simplified
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