Answer
$P(a) = 2a-3$
$P(-x) = -(2x+3)$
$P(x+h) = 2x+2h-3$
Work Step by Step
If $P(x) = 2x-3$
$P(a) = 2a-3$
$P(-x) = 2(-x) -3 = -2x-3 = -(2x+3)$
$P(x+h) = 2(x+h)-3 = 2x+2h-3$
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