Question

If 3 is one of the zeroes of polynomial x³+3x²+kr-24 then k=

Answer 1

Answer:

-30

Step-by-step explanation:

If 3 is a zero of the polynomial, when we substitute 3 in place of x, the polynomial should be equal to 0.

⇒ x³ + 3x² + k - 24

⇒ (3)³ + 3(3)² + k - 24 = 0

⇒ 27 + 27 + k - 24 = 0

⇒ 54 - 24 + k = 0

⇒ 30 + k = 0

∴ k = -30

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