Question

if -5 is the rootof polynomial 2x2+px-15=0 find the value of p

Answer 1

2(√-5)^2+p(√-5)-15=0
2(5)+p(+15√5)=0
10+15√5p=0
15√5p=-10
p=-10/15√5

Answer 2

x = (-5).

2(-2) ^2 + (-2) p = 15

8 - 2p = 15

-2p = 15 - 8

P = (-) 7/2

P = - 3.5