HEY CORMIER(123)! i'll be glad to answer. assuming that those weird bracket thingy mean absolulet valuve, you can assume that x has to be positive. then, that means (x)^2=70, which acordding to my caculator, its bout 8.36. HOPE THIS HELPED!
PS, tell me if im wrong, and if it's AoPS, paste answer herre. -LUNAMORT 4 LIFE or Purely Slytherin
I don't know the correct way to solve this, but first I guessed that x is 8 point something,
which makes floor(x) = 8
And 70 / 8 = 8.75 , so this works: \( \lfloor 8.75 \rfloor \cdot 8.75 = 70 \)