Question 1031094
(x + 15)^2 = 900
:
x^2 +30x + 225 = 900
:
x^2 +30x - 675 = 0
:
(x-15)*(x+45) = 0
:
x is 15 or -45
:
we reject the negative value
:
****************************************
original length of the walls was 15 feet
****************************************