Question

Find the discriminant of the given equation and hence determine the nature of the roots: 2x^2 + x - 1 = 0

Answer 1

2x²+x+(-1) = 0 ; comparing with ax²+bx+c = 0

a = 2, b = 1 , c = -1

D = b²-4ac = 1-4.1.-1 = 1+4 = 5 ...

•°• D >0 hence real and distinct roots