Question

resolva a equação em R:
b) - x2 + 3x - 2 = 0​

Answer 1

$x^2+3x-2=0\\\\\Delta = b^2-4ac\\\\\Delta=3^2-4(-1)(-2)\\\\\Delta=1\\\\x=\dfrac{-b\pm \sqrt{\Delta} }{2a} =\dfrac{-3\pm\sqrt{1} }{-2} \\\\x'=\dfrac{-3+1 }{-2}= 1\\\\x''=\dfrac{-3-1}{-2}=2\\\\S=\{1, \:2\}$