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16 September, 16:40

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

16

8

4

32

+2
Answers (1)
  1. 16 September, 17:02
    0
    16

    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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