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Kazeer [188]
3 years ago
12

Find the condition that the zeros of the polynomial f(x) = x^3+3px^2+3px+r may be in A.P.

Mathematics
1 answer:
nevsk [136]3 years ago
4 0

Answer:


Step-by-step explanation:

note :

( a + b )^3 = a^3 +b^3 +3 a²b +3b²a + b^3...(*)


the condition is : r = 1  and  p=1

put : x= a  and  b = 1  in (*) you have :

(x + 1)^3 = x^3 +3x² +3x +1

the zeros is : x = - 1

bcause : x^3 +3x² +3x +1 = 0     .... (x + 1)^3 = 0  so : x = - 1

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