plot the graph of (50,60), (60,40) and (60,30) , (50,50)
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+ a) is a factor of x2 + px + q
(-a)2 + p(-a) + q = 0
a2 - ap + q = 0 ...(i)
(x + a) is a factor of x2 + mx + n
(-a)2 + m (-a) + n = 0
a2 - am + n = 0 ...(ii)
From (i) and (ii),
-ap + am + q - n = 0
a(m - p) = n - q
a =
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