Question

if x/2=9/3 then x-2 = ​

Answer 1

Step-by-step explanation:

x/2=9/3

x=9×2/3

x=18/3=6

x-2=6-2=4

Answer 2

Step-by-step explanation:

If x^2 + 9/x^2 = 31, what is the value of x - 3/x

A 36

B 25

C 9

D 5

E 3

Dont get this part

- 2*x*3/x

Have just used the formula (a-b)^2 = a^2 + b^2 - 2*a*b.

Here a is x and b is 3/x.

if x-3/x is squared then resultant equation after substitution will be 31 - (6/x). How do you arrive at 5 from this when x is still present?

Since , then .

Finally, --> or -5.