Question

Multiply and simplify: (4 + v8) (4- v8)

Answer 1

is it v^8?

Answer 2

16-64v^2

Answer 3

16(1-4v^2)

Answer 4

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

Answer 5

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

Answer 6

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

Answer 7

@vi3tbloodxx you're wrong...

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

it should be

(4+v8) (4- v8)
=16 - 4v8 + 4v8 - 64v^2
=4^2-(8v)^2

so from here we can see that there's no need to multiply and simplify... just use difference of binom formula : a^2-b^2 =(a+b)(a-b)

\[\LARGE a^2-b^2=(a-b)(a+b)\]

Answer 8

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

Answer 9

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

Answer 10

the v stands for the square root of 8. When squaring a square root the result is the number inside of the square root.

Answer 11

v cannot be a variable due to the fact that variables stands behind the number. Also from the poster previous post, she been using "v" as a square root notation.

Answer 12

hold on... is \[\LARGE v8=\sqrt8\] or \[\LARGE v8=v8\] ??

"v" is a square root or just a letter?? !

Answer 13

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