Please answer this question.

10. * Argand was the first to rigorously prove the fundamental theorem of algebra. We shall follow along his thought process. (a) Prove D'Alembert's lemma: for every polynomial f of degree d > 1, every point z, such that f(20) * 0 and every e > 0, we can always find a point z such that (2 - 2) 1 is a real number satisfying 1+ Enla,l aal then If (2) | > Rd-1 whenever |z| 2 R. (c) Use the two results above to prove the fundamental theorem of algebra