Question

Can someone help me here, I cant figure how to solve this!

Answer 1

@campbell_st

Answer 2

I'd say the easiest method is to substitute the values of x and check to see if you get the solution

x = -1

\[\sqrt[4]{-1 + 81} - \sqrt{-1} = 2\]

well that doesn't work

so try the next... and repeat until you get the answer

Answer 3

it helps to know that 81= 9*9 = 3*3*3*3= \(3^4\)

Answer 4

ok im doing it one sec guys

Answer 5

So by you saying 81 did you get that from x=-1 ... meaning that 81-1=80 making it the answer?

Answer 6

no. x=-1 is not the answer. campbell already checked that.
now try x=1

Answer 7

ok

Answer 8

ONE .. x=1 is CORRECT right?

Answer 9

that's correct...

Answer 10

yes, but how did you get it?

Answer 11

sometimes it's easiest to use use the answers you are given to get the correct answer

Answer 12

interesting