Question 892890
Square garden 900 square meters has four sides 30 meters each.


Area of walkway plus garden is {{{(30+2x)(30+2x)}}}; draw a picture if needed to understand this clearly.


{{{TotalArea-GardenArea=WalkwayArea}}};
The walkway area is given as 700 square meters.
{{{highlight_green((30+2x)^2-900=700)}}}


Can you do the rest?  Solve the equation for x.