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Simply combine the exponents of the variables (if needed). About the integers, just multiply as usual. We can use the Latice Method in multiplying polynomials. 
For example, (2x + 3)(3x + 5) 
                                   2x       +3
                        3x       6x²      6x
                       +5       10x      15

Add them. 
6x² + 6x + 10x + 15
6x² + 16x + 15

In multiplying binomial, we can use the FOIL method but using Latice is better that you can use it always. Hope you understand my explanation ☺ even tho it's not that clear. But still, I hope it helped.

3 5 3
It really helped a lot thanks again :----)
also, we can only use FOIL method in binomial ONLY not trinomial and the others..
Your welcome ☺
Thanks for the information :-----)
your welcome ☺
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