Question

What is the first row of RS?

𝑅 =[
3 0 −2
4 −9 −5
] 𝑆 =[
2 4
−1 0
3 −1
]

Multiple choice question.

A)
[
0 2
]


B)
[
22 −36 −24
]


C)
[
0 14
]


D)
not possible

Answer 1

C) [0 14]

Reason: first row = [3, 0, −2]·S = [3·2 + 0·(−1) + (−2)·3, 3·4 + 0·0 + (−2)·(−1)] = [0, 14].