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Question
If `p(m) = m^3 + 2m^2 - m + 10` then `p(a) + p(-a) =` ?
Solution
`p(m) = m^3 + 2m^2 - m + 10`
`therefore p(a) = a^3 + 2a^2 - a +10` ...(1)
Also,
`p(-a) = (-a)^3 + 2(-a)^2 - (-a)+10`
`=> p(-a) = -a^3+ 2a^2 + a + 10 ` ...(2)
Adding (1) and (2), we get
`p(a) + p(-a)`
`= (a^3 + 2a^2 - a +10) + (-a^3+ 2a^2 + a + 10)`
`= a^3 - a^3 + 2a^2 + 2a^2 - a + a + 10 + 10`
`= 4a^2 + 20`
` therefore p(a) + p(-a) = 4a^2 + 20 `
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