The expression x4 – 2x2 + k will be a perfect square when the value of k is
Answer : Option B
Explanation : (a – b)2 = a2 –2ab + b2
x4 – 2x2 +k = (x2)2 – 2.x2.1+ k
∴ k = (1)2 = 1
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The expression x4 – 2x2 + k will be a perfect square when the value of k is
(a – b)2 = a2 –2ab + b2
x4 – 2x2 +k = (x2)2 – 2.x2.1+ k
∴ k = (1)2 = 1