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Question
Find x, if f(x) = g(x) where f(x) = x4 + 2x2, g(x) = 11x2
Solution
f(x) = x4 + 2x2, g(x) = 11x2
f(x) = g(x) ...(Given)
∴ x4 + 2x2 = 11x2
∴ x4 – 9x2 = 0
∴ x2(x2 – 9) = 0
∴ x2 = 0 or x2 = 9
∴ x = 0 or x = ± 3
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