Question

for what value of k is -2 a zero of polynomial 3x square+4x+2k

Answer 1

3x²+4x+2k
3x²+4x-4
then
by hit and trial method
x=1
3(1)²+4(1)-4
=3

x=-2
3(-2)²+4(-2)-4
12-8-4
=0
then

zero of polynomial is -2

Answer 2

Hey.......!!! here is ur answer......

Here...... Given that polynomial is

3x²+4x+2k..........(1)

and the zero of this polynomial is –2

then we know that on putting x = –2 the solution of this polynomial will be 0.

Now, on putting x = –2 in equation (1)

=> 3(–2)²+4(–2)+2k = 0

=> 3×4–8+2k = 0

=> 12–8+2k = 0

=> 4+2k = 0

=> 2k = –4

=> k = –2 «««««Ans.

thus the required value of k = –2

I hope it will help you........✌️✌️✌️