Найди значение выражения \( a+\frac{8 y-a^{2}}{a} \) при \( a=2 \) и \( y=12 \).

(3) \( (2 x-1) \times(3 y-2) \)

(1) \( (x+2) \times(y+3) \)

) \( x^{2} y^{2}-16 \)

Décomposer en facteurs i. \( a^{n+2}-4 a^{n-2} \) ii. \( x^{-n}+x^{-n-3} \) iii. \( u^{4 m}-v^{-2 n} \)

(b) At the beginning of term II 2023 a school bought 45 bags of maize and 30 bags of beans for a total of sh. 391500 . After midterm break, the school bought 36 bags of maize and 27 bags of beans for a total of sh. 332100 . Using matrix method, find the cost of each bag of maize and beans. (c) marks) (c) In the following term III 2023 the cost of each bag of maize reduced by \( 15 \% \) while the cost of beans increased by \( 5 \% \). The school bought two- thirds of the total bags of maize and beans as per the previous term. Find by matrix method the total cost of the maize and beans that the school bought in term II 2023 . ( 4 marks)