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ok, you know that:
`Area of a rectangle = (rectangle's width) • (rectangle's length)`
right?

YOu are given the area of this rectangle too. it is 512 (square feet)

if you have further questions, ask.

So the formula in the standard form would be (x)*(x+16)-512?

you got so far,
x•(x+16)-512=0

you need to expand the x•(x+16) peace

So by expanding the x*(x+16) piece it would be in its standard form of x^2+16x-512 ? @SolomonZelman

yes

x²+16x-512=0
then sovle for x