Excel LINEST, how to make it into an array function on mac

[HebeHorsley]

Hi, 

I'm trying to calculate OLS regression on excel but have more than 16 variables so am using LINEST. I can't figure out how to make my basic equation:
=LINEST(A2:A48,B2:B48,FALSE,TRUE)

into an array function on Mac

Can anyone help?

Thanks