3 years ago

What number should be added to both sides to complete the square? x^2 + 8x = 4

1 answer:

8 0

Answer:

Step-by-step explanation:

x² + 8x = 4 ⇔ x² + 8x + 16 = 4 + 16 ⇔ x² + 2×4x + 4² = 20 ⇔ (x + 4)² = (2√5)²

Remark : (2√5)² = 20

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