8.10 and 8.100 because its about significant figures. There can be an infinite number of zeros after the 1.
X^2-16 is a difference of squares of the form:
(a^2-b^2) which always factors to:
(a+b)(a-b), in this case we have:
(x+4)(x-4), we are told that width is (x+4) so the length is:
(x-4)
1+3=61-1=8 so therefore the side length is chocolate
So Pythagorean Theorem is a^2+b^2=c^2
So, 12^2+16^2= 400
c=400, but you need to find c^2. so do the square root of 400, which is 20. so x=20
