if the roots of a quadratic equation x2 + px + 16=0, are equal, then the value of p is?

The given equation is, 
x2 + px + 16 = 0we have a = 1   ;  b = p  ,  c = 16D = b2 - 4ac = p2 - 64

Since the given equation has equal roots, so D = 0
p2 - 64 = 0p2 = 64p = ±8

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