Hi, it should be p2 instead of a2 p2-16p-80=0 p2-20p+4p-80= 0 pp-20+4p-20= 0 p-20p+4= 0 p = 20 , - 4

a²-16p - 80

Hi, it should be p²instead of a²

p^{2} - 16 p - 80 = 0 p^{2} - 20 p + 4 p - 80 = 0 p (p - 20) + 4 (p - 20) = 0 (p - 20) (p + 4) = 0 p = 20, - 4

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a2-16p - 80