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प्रश्न
Every invertible function is
विकल्प
monotonic function
constant function
identity function
not necessarily monotonic function
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उत्तर
monotonic function
We know that "every invertible function is a monotonic function".
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Solution: f(x) = 2x3 – 15x2 – 84x – 7
∴ f'(x) = `square`
∴ f'(x) = 6`(square) (square)`
Since f(x) is decreasing function.
∴ f'(x) < 0
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∴ x ∈ `square`
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∴ x ∈ `square`
∴ f(x) is decreasing function if and only if x ∈ `square`
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