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5a, because ur taking the 4 root of something to the fourth power

so why would it be 5a?

it's actually |5a|

radicals are to exponents as division is to multiplication.

Or even powers that is

so I don't understand what the lines represent on the sides of the answer?

Absolute value sign.

so the 4's basically cancel eachother out?

xactely

Yes.

If you have the same power as you have index on your radical it cancels out the exponent.

ok I think I understand. at least better. But what are the lines on each side for?

It's a nit picky detail.

| | is the absolute value operator.