Question

one root of the equation 2x^2-8x-m=0 is 5/2.find the other root and the value of m

Answer 1

put x = 5/2
2 x 25/4 - 8 x 5/2 - m = 0
25/2 - 20 = m
25 - 40 = 2m
m = -15/2
Hope this will help you...