Question

Pls help fast pls pls pls pls pls

Answer 1

Answer:

${3a}^{2} - {7b}^{2} + {2a}^{2} + {b}^{2}$

Step-by-step explanation:

1. Since 2 opposite add up to 0,remove them from the expression (+4ab, - 4ab)

2. Calculate the product