Question

encontre as raízes das equações a seguir a)x² +3x=0 b) x³-20x²+100x=0​

Answer 1

$a)x {}^{2} + 3x - 0 \\ a = 1.b = 3.c = 0 \\ delta = 3 {}^{2} - 4 \times 1 \times 0 \\ delta = 9 - 0 = 9 \\ x = \frac{ - 3 + - \sqrt{9} }{2} \\ x = \frac{ - 3 + - 3}{2} = \\ x 1 = \frac{ - 3 + 3}{2} = > x1 = 0 \\ x2 = \frac{ - 3 - 3}{2} = > x2 = \frac{ - 6}{2} = > x2 = - 3$ as raízes são {0,-3}