3. Dados os polinomios: \( A=2 x^{2}+5 x+3, B=4 x^{2}-2 x+1 \) e \( C=-3 x^{2}-x+3 \), Calcule: \( \begin{array}{ll}\text { a) } A+B & \text { d) } C-A \\ \text { b) } A-B & \text { e) } B+C \\ \text { c) } A+C & \text { 1) } B-C\end{array} \)

Write an equation that expresses the following relationship. \( w \) varies directly with the cube of \( u \) and inversely with \( d \) In your equation, use \( k \) as the constant of proportionality,

d. \( 2 x^{2}+27=-21 x \)

a. \( x^{2}=49 \)

A one-to-one function is given. Write an equation for the inverse function. \( s(x)=\frac{2}{x+4} \) \( s^{-1}(x)=\square \)

Write an equation that expresses the following relationship. \[ d \text { varies directly with } w \text { and inversely with the square root of } p \] In your equation, use \( k \) as the constant of proportionality.