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22 February, 17:51

Which shows the equation below written in the form ax2 + bx + c = 0?

x + 9 = 2 (x - 1) 2

A. 2x2 - 5x - 7 = 0

B. 2x2 - 3x + 11 = 0

C. 2x2 - 3x - 7 = 0

D. 2x2 - 5x + 11 = 0

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Answers (1)
  1. 22 February, 18:05
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    X + 9 = 2 (x - 1) ²

    x + 9 = 2 (x² - 2 x + 1)

    x + 9 = 2 x² - 4 x + 2

    - 2 x² + 4 x + x - 2 + 9 = 0

    - 2 x² + 5 x + 7 = 0 / * (-1)

    Answer:

    A) 2 x² - 5 x - 7
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