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is it v^8?

16-64v^2

16(1-4v^2)

as,
a^2-b^2=(a+b)(a-b)

FOIL
(4+v8) (4- v8)
=16 - 4v8 + 4v8 - 8
= 8

then,
=4^2-(v^8)^2
=16-v^16

a^2−b^2=(a−b)(a+b)\
in this equation (4+v8) (4- v8)
a = 4 and b = v8
4^2 - (v8)^2
gives 16 - 8
= 8

@vi3tbloodxx Still don't get what you're trying to say...O_o where's "v" how come (v8)^2=8 ???

hold on... is \[\LARGE v8=\sqrt8\] or \[\LARGE v8=v8\] ??
"v" is a square root or just a letter?? !

auff... not your fault , I misunderstood ! I apologize , you're right , the answer is 8 :(