Question

Valendo 50 pontos, resposta e a resolução, por favor.

Answer 1

Olá,

8)

x = (-b+√b²-4ac)/2a sendo a = 3, b = -7 e c = 2

x = (-(-7)+√(-7)²-4(3)(2))/2(3)
x = (7+√49-24)/6
x = (7+√25)/6
x = (7+5)/ 6
x = 12/6
x = 2

Resposta:

x = 2

9)

a³-3a²x²y² para a = 10, x = 2 e y = 1

(10)³-3(10)²(2)²(1)²
1000-3(100)(4)(1)
1000-3(400)
1000-1200
-200

Resposta:

-200

Answer 2

$x = \dfrac{-b + \sqrt{b^2 -4*a*c}}{2*a} \\ \\ \\ x = \dfrac{-(-7) + \sqrt{(-7)^2 -4*3*2}}{2*3} \\ \\ \\ x = \dfrac{7 + \sqrt{49 -4*6}}{6} \\ \\ \\ x = \dfrac{7 + \sqrt{49 -24}}{6} \\ \\ \\ x = \dfrac{7 + \sqrt{25}}{6} \\ \\ \\ x = \dfrac{7 + 5}{6} \\ \\ \\ x = \dfrac{12}{6} \\ \\ \\ x = 2$

===
$a^3 - 3a^2 . x^2 . y^2 \\ \\ \\ 10^3 ~- ~3 ~.~10^2 ~. ~ 2^2 ~.~(-1)^2 \\ \\ 1000 - 3~. ~100 ~ . ~ 4~ . ~1 \\ \\ \\ 1000 - 300 . ~ 4 \\ \\ \\ 1000 ~- ~ 1200 \\ \\ \\ =\ \textgreater \ -200$