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Question: If the trinomial x<sup>2</sup> + px + q has a minimum at x = 3 and minimum value is equal to 5, then...

If the trinomial x2 + px + q has a minimum at x = 3 and minimum value is equal to 5, then p and q are –

A

6, 14

B

– 6, 14

C

6, – 14

D

) None

Answer

– 6, 14

Explanation

Solution

f ¢ (x) = 2x + p

at x – 3 Ž 6 + p = 0 Ž p = – 6

Now minimum value is 5 Ž

5 = 9 – 18 + q Ž q = 14