Hi

Note FOIL method: basically a question of combining 4 independent multiplications

(t+1)(t+4)= t^2 + 5t + 4

F	First terms     t*t OR t^2

O	Outside terms    

I	Inside terms     

L	Last terms       1*4 OR 4

                    t^2 + 5t + 4    combining like terms

 

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