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26 September, 19:06

X^2 + 18x + 50 = 9

Solve by completing the square

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Answers (1)
  1. 26 September, 21:39
    0
    Step 1: both sides subtract 50: x²+18x=-41

    step 2: both sides add (1/2 of 18) ², which is 81: x²+18x+81=-41+81

    step 3: make the square: (x+9) ²=40

    step 4: square root both sides: x+9=√40 or x+9=-√40

    simplify: x=-9+2√10 or x=-9-2√10
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