Xét thị trường hai loại hàng hóa X, Y. Giả sử khi mua x (> 0) lượng hàng hóa X và y (> 0) lượng hàng hóa Y, người tiêu dùng thụ hưởng hàm hàm lợi ích U = U(x, y) = 3(x – 2)2(y – 5) – (x – 2)3 – (y – 5)4 + 30.
Xét các khẳng định dưới đây.
(1) U có hai điểm cực trị M1(2, 5) và M2(8, 8)
(2) Cả hai túi hàng hóa (x = 2, y = 5) và (x = 8, y = 8) đều tối ưu hóa lợi ích U
(3) Túi hàng hóa (x = 2, y = 5) không tối ưu hóa lợi ích U
(4) Túi hàng hóa (x = 8, y = 8) không tối ưu hóa lợi ích U
Đếm số khẳng định đúng.

answer: the first one

step-by-step explanation: use a calculator and divide the minutes by the dollars.

more detail

step-by-step explanation:

the correct option is:

b. a value of the variable that makes the polynomial equal to zero.

the root or roots of a polynomial are the values of the variable that makes the polynomial equal to 0. we can find the roots of a polynomial making the expression equal to 0 and then, isolating the variable (it it has just one variable).

for example, given the following polynomial:

the root or zero of the polynomial, can be found by making the expression equal to 0, and then, isolating the variable, so, finding the root we have:

therefore, we have that the root of the polynomial is equal to 2.

we must remember that the number of roots that a polynomial can have, will depend on the degree of the polynomial, a first degree polynomial have will have one single root, a second degree polynomial (quadratic expression) may have two roots and so.

hence the correct option is:

b. a value of the variable that makes the polynomial equal to zero.

have a nice day!