Question

one root of the quadratic equations 2x²-8x-k=0 is 5/2 find value of k and the other root ​

Answer 1

Answer:

2x²-8x-k=0

let x=5/2

put the value of x in the equation

2×(5/2)×(5/2)-8×(5/2)-k=0

(25/2)-20-k=0

12.5-20-k=0

-7.5-k=0

k= -7.5

hence,the value of k is -7.5