Question

desenvolva (4a-16) (4a+16)

Answer 1

$\boxed{(4a-16)(4a+16)=(4a)^2-16^2=16a^2-256}$

Answer 2

( 4a - 16 ) . ( 4a + 16 ) = 0
16a² + 64a - 64a - 256 = 0
16a² - 256 = 0