if p(x)=x²-5x+1, find p(2),p(-1) and hence find p(2)+p(-1).
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Answer:p(x) = 2 + 5x ∴ P(2) = 2 + 5(2) = 2 + 10 = 12 p(x) = 2 + 5x P(- 2) = 2 + 5(- 2) = 2 – 10 = – 8 p(x) = 2 + 5x P(1) = 2 + 5(1) = 2 + 5 = 7 ∴ P(2) + P(- 2) – p(1) = 12 + (- 8) – 7 ∴ P(2) + p(- 2) – p(1) = – 3
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