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natali 33 [55]
3 years ago
5

Which are the solutions of x2 = –5x + 8?

Mathematics
1 answer:
Luda [366]3 years ago
4 0

Answer:

  x = -2.5 ± √14.25

Step-by-step explanation:

Add 5x to prepare for "completing the square."

  x² +5x = 8

Add the square of half the x-coefficient:

  x² +5x + 2.5² = 8 + 2.5²

  (x +2.5)² = 14.25

Take the square root.

  x +2.5 = ±√14.25

Subtract 2.5.

  x = -2.5 ± √14.25 ≈ {-6.27492, 1.27592}

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