Question

If 2x + 1 / x = 5 then write the value of 4x2 + 1 / x2.​

Answer 1

Answer:

21

Step-by-step explanation:

2x + 1/x = 5

(2x + 1/x)^2 = 5^2

4x^2 + 1/x^2 + 2 * 2x * 1/x = 25

4x^2 + 1/x^2 + 4 = 25

4x^2 + 1/x^2 = 25 - 4

4x^2 + 1/x^2 = 21

Answer 2

Answer:

21

Step-by-step explanation:

Do the property of the sum