1. Multiply.

(7x+3) (4x-5)

2. Factor.

49x^8-16y^14

3. Factor.

7x^2+16x+4

1. (7x+3) (4x-5) =

multiply everything by each other than combine like terms

= 28x^2-23x-15

2. 49x^8-16y^14

rewrite 49x^8 as (7x^4) ^2, rewrite - 16y^14 as - (4y^7) ^2

then factor to get (7x^4 + 4y^7) (7x^4 - 4y^7)

3. 7x^2+16x+4 = (7x+2) (x+2)