Topic
Q:
Solve the given system of 3 -variable equations by hand with elimination.
2. \( \left\{\begin{array}{l}5 x+7 y-3 z=3 \\ 3 x+4 y+2 z=6 \\ x+3 y-5 z=-7\end{array}\right. \)
Q:
18 Consider the equation \( x^{2}-2 x+r=0 \), where \( r \) is a real parameter.
\( 1^{\circ} \) Calculate \( r \) so that the roots \( x_{1} \) and \( x_{2} \) exist.
\( 2^{\circ} \) Calculate \( r \) so that :
\( \begin{array}{lll}\text { a) } \frac{1}{x_{1}}+\frac{1}{x_{2}}=-\frac{1}{2} & ; \text { b) } x_{1}^{2}+x_{2}^{2}=6 & \text {; c) } \frac{1}{x_{1}^{2}}+\frac{1}{x_{2}^{2}}=1 \\ \text { d) }\left(x_{1}-x_{2}\right)^{2}=4 & \text {; e) } \frac{1}{x_{1}-2}+\frac{1}{x_{2}-2}=3\end{array} \)
Q:
13. What is the quotient of \( \frac{2 a}{b} \div \frac{4 a}{b} \) ?
\( \begin{array}{llll}\text { A. } \frac{1}{2} & \text { B. } 4 a a b b & \text { C. } \frac{8 a}{2 b} & \text { D. } 8\end{array} \)
Q:
Solve the given system of 3 -variable equations by hand with substitution.
1. \( \left\{\begin{array}{c}x+2 y-7 z=28 \\ y+z=18 \\ 5 z=15\end{array}\right. \)
5z
Q:
Write the equation in its equivalent
logarithmic form. \( 15^{3}=y \)
Q:
Write the equation in its equivalent
exponential form. \( \log _{b} 16=4 \)
Q:
Write an equation with THREE numbers whose sum equals 0 .
.
Q:
Write an equation with THREE numbers whose sum equals 0 .
Q:
б) \( 278,74-(6,5-x)=276,84 \)
Q:
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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