Can anyone HELP with the indicated matrix operations, let B=[-144-3]. Find -2B.

Can anyone HELP with the indicated matrix operations, let B=[-144-3]. Find -2B.
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if yu hav 2 numbers in 1 roe, that be vekter... size =root av sum av squares... 3^2=9, 144^2=20,736, sum=20,745, root=144.0312466
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