Question

Expand (3y²+4) (3y²-4)

Answer 1

Answer:

324

Step-by-step explanation:

= 3y²×3y²+3y²×4+4×3y²+4×4+3y²×3y²-3y²×4-4×3y² -4×4

= 4+4×4×4×4-4×-4×4

= 324

Answer 2

Answer:

=$9y^4-16$

Step-by-step explanation:

(3y²+4) (3y²-4)

=(9y^4) + (-4*3y^2) + (4*3y^2) + (4*-4)

=9y^4-12y^2+12y^2-16

=$9y^4-16$