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3(x² + 2.x.1 + 1²) = 147
3(x² +2x + 1) = 147
3x² + 6x + 3 - 147 =0
3x² + 6x -144 = 0
soluciono la cuadrática
-6±√6² - 4.3. (-144)
--------------------------- =
6
-6 ±√ 1764
-------------- =
6
-6 + 42
x1 = ----------- = 6
6
-6 - 42
x2 ------------- = -8
6
3x² + 6x -144 = (x - 6)(x + 8) forma factoreada de la cuadrática
∛7x-1 +4 = o
∛7x - 1 = -4
7x - 1 = -4³
7x = -64 + 1
x = - 63: 7
x = -9
en este ejercicio tuve que "imaginar"que 7x - 1 estaba debajo de la raíz
saludos