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WAEC Mathematics 2025 Paper

Question : 11

Total: 50

\frac{6x - 1}{x^2 + 4x - 5}

Solution:

Concept:

A fraction is undefined when its denominator is equal to zero.

Explanation:

Set the denominator equal to zero.

x^2 + 4x - 5 = 0

Factor the quadratic expression.

x^2 + 5x - x - 5 = 0

x(x + 5) - 1(x + 5) = 0

(x - 1)(x + 5) = 0

Equate each factor to zero.

x - 1 = 0 \quad \text{or} \quad x + 5 = 0

x = 1 \quad \text{or} \quad x = -5

Answer:

The expression is undefined for

x = -5

x = 1

Correct option: B.

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