Question

Find the discriminant of equation 1 – x = 2x².

Answer 1

1 – x = 2x²

2x² + x – 1 = 0

Compare given equation with the general form of quadratic equation, which is ax² + bx + c = 0

Here, a = 2, b = 1, c = –1

Discriminant formula: D = b² – 4ac

= (1)² – 4 x 2 x -1

= 9