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Explanation:
(x - 2)(x - ½) = 0
x = 2, ½
here, a = P , b = 5 , c = r
let the two zeroes be α and β
α = 2 and β = ½
α×β = c/a
2(½) = r/p
1 = r/p
1×p = r
p = r
HENCE PROVED
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