Respostas

2014-07-22T20:38:52-03:00
Olá, Danielribeirodf!

-3x² + 48 = 0
a = -3
b = 0
c = 48

Δ = b² - 4.a.c
Δ = 0² - 4.(-3).48
Δ = 0 + 576
Δ = 576

-b +- √Δ / 2.a
-0 +- √576 / 2.(-3)
-0 +- 24 / -6

x' = -0+24/-6 = 24/-6 = -4
x'' = -0-24/6 = -24/-6 = 4
2 5 2
2014-07-22T20:47:07-03:00
-3 x^{2} + 48 = 0 3 x^{2} = 48 x^{2} = \frac{48}{3} x^{2} = 16 x= \sqrt{16} x= 4  ou X=-4