Question 444500
Let x be the width.
Let x + 18 be the length.
...
A=l*w
9315=(x+18)(x)
9315=x^2+18x
0=x^2+18x-9315
*[invoke quadratic "x", 1, 18, -9315 ]
...
So, x is the positive number as we are dealing with positive values.
x=87.9329665284211
x+18=105.9329665284211
So therefore, the rectangle movie screen is roughly 88 ft by 106 ft.