## anonymous 4 years ago Find the area of the circle in simplest polynomial form. A = 3.14r2

1. anonymous

A = pi (r)^2

2. anonymous

|dw:1327774538998:dw|

3. anonymous

A. 6.28x2 + 3.14 B. 12.56x2 + 3.14> C. 6.28x2 + 3.14x + 3.14 D. 12.56x2 + 12.56x + 3.14

4. Mertsj

Which one do you think?

5. anonymous

i think b?

6. Mertsj

Well, first we have to square the radius. So what is (2x+1)(2x+1)?

7. anonymous

4x^+4x+1

8. nikita2

$\pi*r^2$ the formula

9. Mertsj

Yes. 4x^2+4x+1 Good for you.

10. anonymous

4x^2 i mean

11. Mertsj

Oh I see that nikita wants to help you now. good bye

12. anonymous

so wat one would it be

13. phi

why do you give up so quickly? you start with A = 3.14r^2 you know r= (2x+1), and you figured out r*r = (2x+1)*(2x+1)= 4x^2+4x+1 so use your result in A= 3.14*( 4x^2+4x+1) this means multiply the 3.14 times each term inside the parentheses A= 3.14*4 x^2 + 3.14*4 x + 3.14*1 even if you left your calculator in the refrigerator when you went looking for the yogurt, you see that the answer has 3 terms which makes A and B wrong. And what ever 3.14*4 is, it's the same number in front of x^2 and x