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(3x²+ 2)³ = (3x²)³ + 3 (3x²)²(2) + 3 (3x²)(2)² + 2³
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2) 3x²- 2x - 5 = 0
a = 3 b = -2 c = - 5 aplicamos formula general
(nos quedamos con esta solución)
3x²- 2x - 5 = 0
3(-1)² - 2(-1) - 5= 0
3 + 2 - 5 = 0