Question

as raizes da equacao x^2-7+12=0 sao A pares b impares c positiva d negativa e nao existe raizes​

Answer 1

X² - 7x + 12 = 0

a= 1

b= -7

c= 12

/\= b² -4·a·c

/\= (-7)² -4·1·12

/\= 49 - 48

/\= 1

$\frac{ - b + - \sqrt{delta} }{2.a}$

$\frac{ - ( - 7) + - \sqrt{1} }{2.1} = \frac{7 + - 1}{2}$

X' =

$\frac{7 + 1}{2} = \frac{8}{2} = 4$

X'' =

$\frac{7 - 1}{2} = \frac{6}{2} = 3$

S= {4,3}

Alternativa C), são positivas.