Cho ánh xạ tuyến tính ƒ:R^3—›R^3 và hai cơ sở của R^3 B={b1=(1,3,3),b2=(—7,6,5),b3=(1,2,2 )}, C={c1=(2,-4,3),c2=( -5,-1,-5),c3=(1,0,1)}
Biết f(b1)=(—5,6,4), f(b2)=(-8,5,2), f(b3)=(-9,-2,6)5)
a. Tìm mạ trận A =[f]E3 , từ đó suy ra biểu của f(x1,x1,x3)
b. Tìm ma trận [f]B
c. Từ [f]B, hãy tính ma trận [f]C/B
d. Cho vector z =(-2,3,7), hay tính [x]B, và suy ra [f(x)]c

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2 equivalent expressions to represent the area of a rectangle and the top is n-3 and the side is 2

area of the rectangle = length * width

given length = n - 3

width = 2

replace it in the area

so area of the rectangle = (n-3) *2

= 2(n-3)

one of the expression is 2(n-3)

to get another expression we distribute 2 inside the parenthesis

2(n-3) is 2n - 6

so another expression is 2n - 6

two equivalent expression are

2(n - 3)   , 2n - 6