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The Brainliest Answer!
2016-06-24T08:54:26+08:00
In using FOIL method 
 
(2-a)(4-a)  

 2 x 4 = 8 , 2 x -a = -2a , -a x 4 = -4a  , -a x -a = a^2   so we simlify this in standard form 
a^2 - 2a - 4a +8    and then sum up -2a + -4a  = - 6a    and we can arrange now in highest exponent in to lowest    

so the answer must be    a^2 - 6a + 8 
1 5 1