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(2) P(m) + P(-m) = -3m-1 + (-3)(-m) -1 = -3m-1 +3m-1 = -2
(3) P(2m-1) = -8(2m-1)+5 = -16m+8+5 = -16m+13
(4) P(x+1) =x ⇒ P(x)= x-1 ⇒ P(m)= m-1
(5) x-2 = 2m ⇒ x=2m+2 ⇒ P(x-2)= 2m+2+3 = 2m+5