Solve seven x square 2 plus twenty x negative three equals? 7x2+20x-3=

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97971 97971

28-04-2015
Mathematics

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Solve seven x square 2 plus twenty x negative three equals? 7x2+20x-3=

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Panoyin Panoyin · Answer 1 · 2015-04-28T19:22:39-04:00

7x² + 20x - 3 = 0
x = -(20) +/- √((20)² - 4(7)(-3))
       2(7)
x = -20 +/- √(400 + 84)
   14
x = -20 +/- √(484)
   14
x = -20 +/- 22
   14
x = -20 + 22 x = -20 - 22
   14    14
x = 2 x = -42
   14 14
x = ¹/₇                x = -3