Question 1178857


A rectangular swimming pool with
dimensions of 11m and 8m 
Area of pool = 11*8=88 m*2

let the width of the of side walk be x

total area = (11+2x)(8+2x)=1120

88+22x+4x^2 +16x=1120

4x^2+38x -1032=0

4x^2-48x+86x-1032=0

4x(x-12)+86(x-12)=0

(x-12)(4x+86)=0

roots 12, -21,5

ignore negative

x=12m the width of walkway