Question

Ayudaaaaaa!!!!!!!!!!!!!!!

Answer 1

A) (x+2)(x-2) =  χ²-2x+2x-4 = χ²-4
b) (2x+4)(2x-4)= 4χ²-8x+8x-16 = 4χ² -16
c) (1-χ²)(1+χ²) = 1+χ²-χ²-x⁴ = 1-x⁴ 
d) (3a-4a²)(3a+4a²)= 9a²+12a³ -12a³-16a⁴=9a²-16a⁴