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the discrimant of a quadratic equation
I.e (ax² + bx + c =0 ) with equal root is given by b² - 4ac = 0
from the question
x² + px +16 = 0
a = 1 b= p and c = 16
b² = 4ac
p² = 4 × 1 × 16
p² = 64
take the square root of both side
√p² = √64
p = 8
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