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If 1 - I, is a root of the equation x² + ax + b = 0, where a, b, ∈ R, then the value of a - b is?

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If 1 - I, is a root of the equation x² + ax + b = 0, where a, b, ∈ R, then the value of a - b is? Answer: -4

Using the property that complex roots appear in conjugate pairs for real-coefficient quadratics, we find the sum and product of roots to determine 𝑎−𝑏=4.

Question context

This question is part of 📏 Arithmetic Aptitude within the broader 🧠 Aptitude Mastery subject and appears in the SPSC – Sindh Public Service Commission preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.