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The answer for your question is two
answer of your question 2*4-6=2
we know that,
b(x) = 2x-6, then
b(4) = 2(4)-6
b(4) = 8-6
b(4) =2 answer
two...........................................................................
b(4)=2*4-6=2 it's the result
the right answer will be two for b(x)