Question

If one zero of the quadratic polynomial (k + 3) x2 + kx + 3 is −2 find k

Answer 1

HOL@ M@T€...!!!

Zero of p(x) is =-2

p(x) = (k+3)x²+kx+3

To Find :- value of k

putting value of x = -2 and putting p(x) = 0

(k+3)x²+kx+3=0

(k+3)×(-2)²+k(-2) +3 =0

(k+3)4-2k+3=0

(k+3)1-2k=0

k+3-2k=0

-2k+k=-3

-k=-3

k = 3

Hope it helps you...

Answer 2

hey mate

given polynomial

(k+3)x²+k x + 3=0. .....(1)

if -2 is s zeroes of given polynomial

so,

x=-2 satisfies this polynomial

,

so

x= -2 , put in equation (1),we get

(k+3) (-2)² + k(-2)+3=0

4k +12 -2k +3=0

2k= -15

k= -15/2

thus :

value of k = -15/2

I hopes its help's u.

please follow me!!✌✌

@abhi.