Question

P(X)=3x²+kx-2
a.value of k ?​

Answer 1

Answer:

Answer

In a general quadratic equation of form ax

2

+bx+c=0, sum of roots are by

a

−b

.

In the given quadratic equation, 3x

2

−kx+6=0

a=3,b=−k,c=6

Sum of roots =

a

−b

=

3

−(−k)

=

3

k

and sum of roots is given 3

⇒

3

k

=3

⇒

k=9

Step-by-step explanation:

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Answer 2

Answer:

k=2√6

Step-by-step

p(x)=3x²+kx-2

a=3, b=k, c=-2

D=b²-4ac

putting the values,

D= (k)²-4(3)(-2)

D=k²-4(-6)

D=k²+24

so, k²+24=0

k²=24

k=√24

k= 2√6