Turnbull Joseph
08/17/2024 · Senior High School
3. Sea \( f: \mathbb{R} \rightarrow \mathbb{R} \) una función cuadrática cuya fórmula es \( f(x)=-3 x^{2}+6 x+9 \). Graficar \( f \) e indicar, partir del gráfico, el conjunto de ceros, de positividad y de negatvidad de \( f \).
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Los ceros de la función son \( x = -1 \) y \( x = 3 \). La función es positiva en el intervalo \( (-1, 3) \) y negativa en \( (-\infty, -1) \) y \( (3, \infty) \).
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