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Multiplication of Matrices

Find k if ...

Question

Find $k$ if $[k c o s α sin α] ⎡ ⎢ ⎣ \begin{matrix} k cos α sin α \end{matrix} ⎤ ⎥ ⎦ = [17]$

A

k = 4

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B

k = 5

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C

k = 6

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D

k = - 4

.

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Solution

The correct options are
A $k = 4$
D $k = - 4$ .

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sin α + cos α = k

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