June 2024 Paper 3 Q2

2 The quadratic equation

\[4x^2 + bx + 9 = 0\]

has one repeated real root.

Find \(b\)

Circle your answer. [1 mark]

• \(b = 0\)
• \(b = \pm 12\)
• \(b = \pm 13\)
• \(b = \pm 36\)