Area of Square As Function of x

Section 1.5
Question 88

See attachment.

I think we need to find A(x).

Area of square = (side)^2

I understand the given side to be (x^2 + 8).

I say A(x) = (x^2 + 8)^2 represents the area of the square as a function of x.

Domain = All R

Note: R = all real numbers.

 

Question 88
we already did it, find it and see the answer

 

Ok. I'll search for it. Is my reply here wrong considering that we already did 88? That would be shameful.

 

yes, it is wrong and you made same mistake as first time
take good look at picture, you need to cut of the area of four small triangles from the area of big square

 

I made the same mistakes TWICE on the SAME problem. I am speechless.

 

Let me see.

8 meters times 8 meters minus (x•x + x•x)

A(x) = 64 - (x^2 + x^2)

A(x) = 64 - 2x^2

Domain: ALL REAL NUMBERS.