Question

If -5 is a root of the quadratic equation 2x ^2+px-15=0 and the quadratic equation p (x^2+x)+k=0 has equal roots, find the value of know

Answer 1

Answer:17

Step-by-step explanation:

100-5p-15=0

85=5p

P=17

Answer 2

Answer:

k=7/4

Step-by-step explanation:

2x^2+px-15=0

by substituting -5 instead of x we get

p=7

substitute the value of p in the other equation

7x^2+7x+k=0

Since it has equal roots D=0

or b^2-4ac=0

or 49=28K

K=7/4