Question

identifique os coeficientes e calcule o diacriminante para cada equação
a)
$2 { \times }^{2} - 11 \times + 5 = 0$
b)
$2 { \times }^{2} + 4 \times + 4 = 0$
c)
${ \times }^{2} - 11 \times + 28 = 0$
d)
$4 { \times }^{2} + 2 \times + 1 = 0$
​

Answer 1

Resposta:

Explicação passo-a-passo:

$a)\\\\a=2\\b=-11\\c=5\\\\\Delta=b^{2}-4.a.c\\\\\Delta=(-11)^{2}-4.2.5=121-40=81\\\\b)\\\\a=2\\b=4\\c=4\\\\\Delta=b^{2}-4.a.c\\\\\Delta=4^{2}-4.2.4=16-32=-16\\ \\c)\\\\a=1\\b=-11\\c=28\\\\\Delta=b^{2}-4.a.c\\\\\Delta=(-11)^{2}-4.1.28=121-112=9\\ \\d)\\\\a=4\\b=2\\c=1\\\\\Delta=b^{2}-4.a.c\\\\\Delta=2^{2}-4.4.1=4-16=-12$