Root on A string
x-8-9-8-10-x
F7♭5 is the F dominant 7 flat 5 chord. Its notes are F, A, C♭ and E♭. A four-note altered dominant. Mute both outer strings.
x-8-9-8-10-x
Numbers show frets from the low E string to the high e string; x means don't play that string.
Every F, A, C♭ and E♭ on the first 12 frets. The filled dots are the root, F. Build your own shape from any nearby group.
Other F chords
Other dominant 7 flat 5 chords