Question

If sum of zeroes of the quadratic polynomial 2x² + kx-6 is 2, then value of k is:​

Answer 1

Answer:

Answer

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Correct option is

A

9

In a general quadratic equation of form ax2+bx+c=0, sum of roots are by a−b.

In the given quadratic equation, 3x2−kx+6=0

a=3,b=−k,c=6

Sum of roots =a−b=3−(−k)=3k

and sum of roots is given 3

⇒3k=3

⇒k=9

Answer 2

Answer:

Compare 2x² + kx - 6  with ax² + bx + c,

a = 2 ,

b = k ,

c = -6 ,

According to the problem given ,

Sum of the zeroes = 2

- b / a = 2

- k / 2 = 2

k = -4

Explanation:

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