Posted by Anonymous on Saturday, February 9, 2013 at 8:16am.
p(x) = (px^7+qx^3+rx) - 5
p(-x) = -(px^7+qx^3+rx) - 5
p(-x) + 5 = -(p(x)+5)
p(-7) + 5 = -p(7) - 5
p(-7) = 7 - 10
p(-7) = -3
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