Question

me ajudem, preciso da conta

Answer 1

5. a=1 b=-8 c=7
$d = {b}^{2} - 4ac \\ d = { - 8}^{2} - 4.1.7 \\ d = 64 - 28 \\ d = 36 \\ \\ \\x = \frac{ - b + - \sqrt{d} }{2.a} \\ x = \frac{ - ( - 8) + - \sqrt{36} }{2.1} \\ x = \frac{8 + - 6}{2} \\ {x}^{1} = \frac{8 + 6}{2} = \frac{14}{2} = 7 \\ {x}^{2} = \frac{8 - 6}{2} = \frac{2}{2} = 2$
6. a) d>0