Find the product and simplify? (Vx+1/Vx)(Vx-1/Vx)?

Question

Find the product and simplify? (Vx+1/Vx)(Vx-1/Vx)?

Answer 1

V^2X^2-1+1-1/v^2x^2

=V^4X^4-1

Znoname,

you have a mistake 'cause it's minus one plus one=0 instead of 2

Answer 2

FOIL ( First, Outside, Inside, Last)

First - VX x VX = V^2X^2

Outside - VX x 1/VX = 1

Inside - 1/VX x VX = 1

Last - 1/VX x1/VX = 1/V^2X^2

Then add it all up and you get:

V^2X^2 + 1/V^2X^2 +2