Question

Find the discriminant of the following equation:

1 – x = 2x²

Answer 1

2x² + x – 1 = 0

Here,

a = 2

b = 1

c = –1

Discriminant D is given by

D = b² – 4ac

= 1² – 4 × 2(–1)

= 1 + 8

= 9