4x2 + kx + 2 = 0

(v) 4x² + kx + 2 = 0

Sol. 4x² + kx + 2 = 0

Comparing with ax² + bx + c = 0 we have a = 4, b = k, c = 2

∆  = b² – 4ac

= (k)² – 4 (4) (2)

= k² – 32

∴ ∆  = k² – 32