$\"\"$

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The function $\"\"$ .

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Divide numerator and denominator by x .

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$\"\"$

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$\"\"$

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$\"\"$ .

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To find the $\"\"$ values, use definition of limits at infinity.

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If $\"\"$ is positive value, then $\"\"$ and $\"\"$ ,such that $\"\"$

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$\"\"$

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$\"\"$

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Squaring on each side

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$\"\"$

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Rewrite the above expression

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$\"\"$

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$\"\"$

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Therefore $\"\"$ $\"\"$ .

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$\"\"$

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(a)

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Find $\"\"$

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Now for $\"\"$ then

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$\"\"$

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$\"\"$

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For $\"\"$ then $\"\"$

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$\"\"$

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(b)

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Find $\"\"$

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Now for $\"\"$ then

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$\"\"$

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For $\"\"$ then $\"\"$

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$\"\"$

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(a) If $\"\"$ then $\"\"$ .

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(b) If $\"\"$ then $\"\"$ .