Question

multiply 2 sqrt of x+1 and 2 sqrt of x-1

Answer 1

\[2\sqrt{x+1} \times 2\sqrt{x-1} \implies (2\times 2) \times (\sqrt{x+1} \times \sqrt{x-1})\]
does that help?

Answer 2

am i not going to use the foil method?

Answer 3

you're going to use the FOIL method too \[\implies 4 \times \sqrt{(x+1)(x-1)}\]
you FOIL that (x+1)(x-1)

Answer 4

but not in the first step of that ,thank you

Answer 5

welcome

Answer 6

and you use FOIL when you have something like \[(a+b) \times (c +d)\]this is more like \[ab \times cd\]

Answer 7

but not the one like i gave

Answer 8

lol nevermind my metaphor =))