If p(m)=m³+2m²-m+10 then p(a)+p(-a)=?
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P(m) = m ^ 3 + 2m ^ 2 - m + 10
P (a) + P(-a) = [a³ + 2a² − a +10] + [(-a)³ + 2(-a)²-(-a) +10]
=a³ + 2a²a + 10 + [−a³ + 2a² + a +10]
=a³ + 2a²a + 10 - a³ + 2a² + a +10
= 4a² + 20.
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