2) \( 3 x+\frac{9}{7}=\frac{5 x}{3}+11 \)

\( \begin{array}{l}\qquad x=8 \\ \text { So, length of the given rectangle }=(8+9) \mathrm{cm}=17 \mathrm{~cm} \\ \text { And, breadt of the given rectangle }=8 \mathrm{~cm} .\end{array} \) EXERCISE 15 B 1. 17 less than four times a number is 11 . Find the number.

लगाजनुहोस्ट । If \( \left[\begin{array}{cc}8 & -2 \\ 1 & 4\end{array}\right] A=2\left[\begin{array}{l}6 \\ 5\end{array}\right] \) then find matrix \( A \).

1. Dado o Polinómio \( P(x)=x^{3}-2 x^{2}+10 \), determine: a) O grau do polinómio \( \begin{array}{l}\text { b) O coeficiente principal } \\ \text { b) O Coeficiente independente. } \\ \text { (1 valor) } \\ \text { d) } x=-2 \text { é uma raíz do polinómio? } \\ \text { (1 valor) } \\ \text { 2. Dado os polinómios } P(x)=x^{2}+x-6 \text {, determine: } \\ \text { a) O Dobro da quinta parte de } \mathrm{P}(\mathrm{x}) \\ \text { b) } P(3)\end{array} \)

15. Determine whether the function \( f: \mathbf{Z} \times \mathbf{Z} \rightarrow \mathbf{Z} \) is onto if a) \( f(m, n)=m+n \). b) \( f(m, n)=m^{2}+n^{2} \). c) \( f(m, n)=m \). d) \( f(m, n)=|n| \). e) \( f(m, n)=m-n \).

14 Ber 10 pat Napata 18 분 D 8 2. 3472/1 (b) Selesaikan persamaan \( 5+4 \sqrt{k}=9+8 \sqrt{2} \). Tulis jawapan dalam bentuk \( a+b \sqrt{2} \) dengan \( a \) dan \( b \) ialah integer. Solve the equation of \( 5+4 \sqrt{k}=9+8 \sqrt{2} \). Write the answer in the form of \( a+b \sqrt{2} \) with \( a \) and \( b \) are integers. [2 markah] [2 marks]