Question

plzz help me to solve this question...​

Answer 1

2x² + px - 15 =0

2(-5)² + p(-5) - 15 =0

50-5p-15=0

5p= 35

P= 7

P(x² +x) +k=0

7x² + 7x +k =0

Its roots are equal then d=0

B²-4ac =0

7² - 4(7)(k) =0

49-28k=0

49=28k

K= 49/28

K = 7/4