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can you understand ? @jchavez96

okay :)

4th option is right , you want to know how , or do you know ?

Can you explain it to me please ?

now take b^2-5b+4 and simplify it
like u do spliting the middle term
so....b^2-5b+4
b(b-4)-1(b-4)

(b-1) (b-4)

now {40a/(b-1)(b-4)}/{5a^2/2b-2}

take the main denominater in reciprocal form
then cancel 40a with 5a^2

now 16b-16/(b-1)(b-4) = 16(b-1)/(b-1)(b-4)

cancel b-1
u'll get opt4

(i.e) = 16/b-4

@jchavez96 understood now ?

I see . . . Thank you !! What is the b=4 for ? The one with the equal sign crossed out ?

dat's b not equal to 4
just substute b as 4
u wont get correct answer

understood @jchavez96

no mention :)