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Evaluation of Functions. What is f(a+1) if f= f(x) = 4x-3?

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Shinalcantaraviz
Given function:
    f(x) = 4x - 3
for f(a+1).. just plug in the value of x which is a+1. so you'll have
f(x) = 4x - 3
f(a+1) = 4(a+1) - 3
f(a+1) = 4a + 4 - 3
f(a+1) = 4a +1