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WAEC Mathematics 2020 Paper

Question : 20

Total: 48

The expression

\frac{5x+3}{6x(x+1)}

will be undefined when x equals

Solution:

Concept:

A rational expression is undefined when its denominator equals zero.

Explanation:

The denominator is

6x(x+1)

Set the denominator equal to zero:

6x(x+1)=0

Apply the zero product property:

6x=0 \quad \text{or} \quad x+1=0

Solving gives:

x=0 \quad \text{or} \quad x=-1

Therefore, the expression is undefined for

x \in \{0,-1\}

Answer:

\{0, -1\}

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