SOLUTION: how do you express (4a-3) squared as a trinomial? my teacher says to FOIL but i dont know how. iv gotten 16a squared -9 but i dont think it is right.

Question 657395: how do you express (4a-3) squared as a trinomial? my teacher says to FOIL but i dont know how. iv gotten 16a squared -9 but i dont think it is right.

Answer by ewatrrr(24785) (Show Source): You can put this solution on YOUR website!

 

Hi,

(4a-3)^2

(4a-3)(4a-3) = 16a^2 - 24a + 9

When using FOIL, the 'middle'term is the sum of the outside and inside products

F	First terms    16a^2

O	Outside terms  -12a

I	Inside terms   -12a

L	Last terms  (-3)(-3) = 9 

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