Explain why the expression in the denominator must be said equal to zero when determining the function’s domain Please help me on this.

The denominator in a fraction cannot be zero because division by zero is undefined. So we need to figure out what values of the variable(s) in the expression would make the denominator equal zero. These values cannot be included in the domain, so they're called excluded values.

Step-by-step explanation:

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step-by-step explanation:

the answer is a.

step-by-step explanation:

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