Question

For what value of k is 3 a zero of thepolynomial 2x^2+x+k.
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Answer 1

Hey mate hope it helps you..

2x² + x + k = 0

2(3)² + 3 + k = 0

21 + k = 0

k = -21

Answer 2

Answer:

+x+ k

Report by Tat1 22.04.2016

Answer

The polynomial is :

2x² + x + k

Suppose, 3 is zero of polynomial for some value of k, then

2x² + x + k = 0

∴2(3)² + 3 + k = 0 (Putting x = 3)

∴2*9 + 3 + k = 0

∴18 + 3 + k = 0

∴21 + k = 0

∴k = -21

Thus, for k = -21, 3 is a zero of the polynomial.....