Hi,

     .

A = Lw

(w+4)w = 60cm^2

w^2 + 4w - 60 = 0 (Tossing out the negative solution for unit measure)

(w +10)(w-6) = 0

w = 6cm  and L = 10cm 

And...checking

A = 60cm^2

Wish You the Best in your Studies. 

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