The expression 'x² - 4x + m' is a complete square when m is?
- +4
- -4
- +16
- None of these
Explanation
For x² - 4x + m to be a complete square, it must match (x - a)² = x² - 2ax + a²
Compare: -2a = -4 → a = 2
So m = a² = 2² = 4
Check: x² - 4x + 4 = (x - 2)²
Last verified on 14-04-2026
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