1. Factorize 25h^2-(h^2+8h+16) .點計到個answer係 8(3+2)(-1) .
2.Volum of the cubid : 2(x+1)^3-12(x+1)^2+18(x+1) , the base of a cubiod is a square with sides of (x-2)cm each , the height of the cubiod : 2(x+1)cm
(a) If the side of a square is equal to the height of the cubiod,the area of the square is (Ax^2+Bx+c)cm^2.Find the values of A,B and C.