If -5 is the root of equation . 2x2 +px -15=0. And the equation p (x2+ x)+ k=0 has equal roots . Find k
Answers
Answered by
7
Answer:
plzzz give me brainliest ans and plzzzz follow me
Attachments:
Answered by
6
Answer:
p = 7
k= 7/4
Step-by-step explanation:
given, x= -5
2 × -5² -5p -15 = 0
2 × 25 -5p -15 = 0
50 -15 -5p = 0
35 -5p = 0
35 = 5p
p = 35/ 5
p = 7
For equal roots , discriminant = 0
b²- 4ac = 0
p² - 4pk = 0
(since p = 7)
7² - 28k =0
49 = 28k
k = 49/28
k= 7/4
Similar questions