Number 8 is confusing

A landscaper is creating a rectangular flower bed such that the width is half of the length . the area of the flower bed is 34 square feet . write and solve the equation determine the width of the flower bed , to nearest tenth of floor .
Answer :
it says that width is half the length . which also implies that length is double the width . as we shift the 2 from denominator , it gets multiply on RHS
let the length be 2x
and
width be = x
length × breadth = 34
2x × x = 34
2x^2 = 34
[tex]{x} = \sqrt{34} [/tex]
x = width = 5.8309518948