Check all of the following cartesian products in which the following elements belong:
a= {1,3,5}
b= {2,3}
1) (1,2)
[] b x a
[] b x b
[] a x b
[] a x a
2) (3,1)
[] b x a
[] b x b
[] a x b
[] a x a
3) (1,1)
[] b x a
[] b x b
[] a x b
[] a x a
4) (3,3)
[] b x a
[] b x b
[] a x b
[] a x a

x =±sqrt(1/3)

step-by-step explanation:

x+4/6x=1/x

multiply each side by 6x to get rid of the fractions

6x*(x+4/6x)=1/x*6x

distribute

6x^2 +4 = 6

subtract 4 from each side

6x^2 +4-4 = 6-4

6x^2 =2

divide by 6

6x^2/6 = 2/6

x^2 = 1/3

take the square root of each side

sqrt(x^2) = ±sqrt(1/3)

x =±sqrt(1/3)