1. Show that the function p() = x + 4x3 – 9 has two real roots, that is, there exist r1, r2 ER such that ri r2 and %3D p(r1) = 0 = p(r2). (Note: Before you use a theorem, make sure that the assumptions are met.)

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A: Option (d) is correct.

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A: See the attachment.