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4x2 + kx + 2 = 0
(v) 4x
2
+ kx + 2 = 0
Sol.
4x
2
+ kx + 2 = 0
Comparing with ax
2
+ bx + c = 0 we have a = 4, b = k, c = 2
∆ = b
2
– 4ac
= (k)
2
– 4 (4) (2)
= k
2
– 32
∴ ∆ = k
2
– 32
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