Question

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If a = 21 +1 -k, b = -T + 27 - 4k, c =1+1+ k then find (a xb). (b × c
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Answer 1

Answer:

$a \times b \\ a = 21 + 1 - k\\ b = - t + 27 \\ c = 1 + 1 + k \\ a \times b = 22 -k \times - t + 27 \\ a \times b = 594 - k - t\\ b \times c = - t + 27 \times 2 + k \\ b \times c = - t + 54 + k$