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

Sagot :

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