find the value or values of the Y in the quadratic equation y squared + 4 y + 4 equals 7

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pbear59 pbear59

06-10-2015
Mathematics

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find the value or values of the Y in the quadratic equation y squared + 4 y + 4 equals 7

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Panoyin Panoyin · Answer 1 · 2015-10-07T02:46:16+02:00

y² + 4y + 4 = 7
   - 7 - 7
y² + 4y - 3 = 0
   y = -(4) ± √((4)² - 4(1)(-3))
   2(1)
   y = -4 ± √(16 + 12)
   2
   y = -4 ± √(28)
      2
   y = -4 ± 2√(7)
      2
   y = -2 ± √(7)
   y = -2 + √(7) U y = -2 - √(7)