PLEASE HELP I DONT KNOW WHAT TO DO !! I APPRECIATE IT IF YOU HELP ME !

Question

asked Feb 23, 2021 113k views

1 Answer

Bandicoot · Answer 1 · 2021-03-01T11:39:27+0000

Answer:

x = ±20

Explanation:

x^2 -1=399

Add 1 to each side

x^2 = 399+1

x^2 = 400

Take the square root of each side

sqrt(x^2) = ±sqrt(400)

x = ±20