Mathematics for IGCSE & O level - Algebraic Manipulation (Section 5 - No. 9)
When completing the square for the expression x² - 4x + 5, the number to add and subtract inside the parentheses is:
1
2
4
5
Explanation
You take half of the coefficient of the x term (-4), square it (-2² = 4), and that's the value to add and subtract.
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