Question

For what value of k is -3 a zero of the polynomial 3x2+4x+2k

Answer 1

Answer:

Hence, k = -7. 5

Step-by-step explanation:

Given,

p(x) = 3x^2 + 4x + 2k

And (-3) is the zero of p(x).

So, x = -3

By remainder theorem, we get,

p(-3) = 3 × (-3)^2 + 4 × (-3) + 2k

=> 3 × 9 + (-12) + 2k = 0

=> 27 - 12 + 2k = 0

=> 2k + 15 = 0

=> 2k = -15

=> k = -15/2 = -7.5

Hence, k = -7. 5

Answer 2

Answer:

3x^2+4x+2k=0

3*-9+4*-3+2k=0

-27+36-2k=0

9-2k=0

-2k=-9

2k=9

k=9/2

Step-by-step explanation:

This is the answer of this question

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