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a square banner had 4 feet added its width and 2 feet subtracted from its height. the banner then had an area of 91 square feet. how long was a side of the original square banner?

The length side of the original square banner was 9 ft

Step-by-step explanation:

Let

x-----> the length side of the original square banner

we know that

The new area of the banner is equal to

Solve for x

Solve the quadratic equation by graphing

The solution is x=9 ft

see the attached figure

zero

step-by-step explanation:

f(2)= x-2

plug in the 2 in the "x"

f(2)=2-2

f(2)=0