Question

if - 4 is a root of of the equation x2+px-4=0 and the quadratic equation x2+px+k=0 has equal roots then the value of k is
a. 9/4
b. 4/9
c. -9/4
d. -4/9​ plz answer

Answer 1

Answer:

k= -4

Step-by-step explanation:

x2+px-4=0

(-4)2-4p-4=0

16-4p=4

4p=8

p=2

x2+2x-4=0

x2+2x+k=0

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

16-8+k=0

4+k=0

k=-4

Hope this answer will helpful