A rectangle has a height of 7a27a^2 7a 2 7, a, squared and a width of a4+5a2+4a^4+5a^2+4 a 4 +5a 2 +4 a, start superscript, 4, end superscript, plus, 5, a, squared, plus, 4 .

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)