(3a-2b)(3a+3b) so this is foil but i always get messed up on it does anyone now how to do it

Answer:9a^2 +  3ab  - 6b^2Step-by-step explanation:(3a-2b)(3a+3b)First term of each grouping is 3a and 3a.Multiply those you get 9a^2.Outer term of each grouping is 3a and 3b.Multiply those you get 9ab.Inner term of each grouping is -2b and 3a.Multiply those you get -6ab.Last term of each grouping is -2b and 3b.Multiply those you get -6b^2.Add up all your products from above.9a^2+9ab+-6ab+-6b^2There are like terms here.  The 9ab+-6ab which is 3ab.So you can write your expression now as:9a^2 + 3ab  +-6b^29a^2 +  3ab  - 6b^2