Question

the length of a rectangular garden is 3m greater than the width. The area is 70m squared. find the dimensions of the garden.

Answer 1

l=3+w
a=l*w=70
70=l*w
70=(3+w)w
70=w^2+3w
w^2+3w-70=0
(w+10)(w-7)
w=-10 or 7
7 is the only valid width
so w=7
l=w+3=7+3=10
so
w=7
l=10