mahoganey1 mahoganey1
  • 29-03-2015
  • Mathematics
contestada

extracting the square root.
(4x+7)^2=60

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Panoyin
Panoyin Panoyin
  • 30-03-2015
(4x + 7)² = 60
4x + 7 = +/-√(60)
4x + 7 = +/-√(4 · 15)
4x + 7 = +/-√(4)√(15)
4x + 7 = +/- 2√(15)
4x = -7 +/- 2√(15)
1/4 · 4x = 1/4(7 +/- 2√(15))
x = 1 3/4 +/- 1/2√(15)
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