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Mathematics for IGCSE & O level - Equations (Section 5 - No. 16)

If you were to 'complete the square' for x² + 8x + 7 = 0, what number would you add and subtract?
4
16
8
7

ব্যাখ্যা

Half of 8 is 4, then square it: 4² = 16.

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