Can someone please explain why marks were taken off in this limit question

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The discussion centers on the mathematical principle regarding limits, specifically the product of limits. The teacher emphasizes that the limit of a product, lim[f(x)*g(x)], is equal to the product of the limits, lim[f(x)]*lim[g(x)], only if both individual limits exist. This principle is rooted in the formal definition of limits and continuity, which dictates that limits cannot be solved independently without considering their interdependence. Therefore, solving limits sequentially without adhering to these rules can lead to incorrect conclusions.

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FrancisG
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My teacher says I have to solve all the limits at once, but I don't understand why it is mathematically incorrect to solve one limit before the other. The test is here:
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Is lim[f(x)*g(x)] = lim[f(x)]*lim[g(x)] ALWAYS?
 

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