Answer
$P(a) = 5a+1$
$P(-x) = 1-5x$
$P(x+h) = 5x+5h+1$
Work Step by Step
If $P(x) = 5x+1$
$P(a) = 5a+1$
$P(-x) = 5(-x)+1 = -5x+1 = 1-5x$
$P(x+h) = 5(x+h)+1 = 5x+5h+1$
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