Question

i)If 3 the Zero of the polynomial x²+ mx - 6 ,then find the value of m
ii) Find the zeroes of the polynomial 3x² -7

I think this one is little complicated ×_×​

Answer 1

Answer:

Step-by-step explanation:

X^2+mx-6

If 3 is one zero then other zero be ‘b’

3+b= -m

3b = -6

Then b=-2

Now from 3+b=-m

3-2=-m

1= -m

m= -1

Answer 2

Answer:

k = 3

Step-by-step explanation:

In a general quadratic equation of form

ax²+ bx + c=0, sum of roots are by

–b

a

In the given quadratic equation,

3x² − kx + 6 = 0

a = 3,b = −k ,c = 6

Sum of roots = –b = –(–k) = k

a 3 3

and sum of roots is given 3

⇒ k/3

⇒ k = 9