anonymous
  • anonymous
Find the area of the circle in simplest polynomial form. A = 3.14r2
Mathematics
chestercat
  • chestercat
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anonymous
  • anonymous
A = pi (r)^2
anonymous
  • anonymous
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anonymous
  • 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

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Mertsj
  • Mertsj
Which one do you think?
anonymous
  • anonymous
i think b?
Mertsj
  • Mertsj
Well, first we have to square the radius. So what is (2x+1)(2x+1)?
anonymous
  • anonymous
4x^+4x+1
nikita2
  • nikita2
\[\pi*r^2\] the formula
Mertsj
  • Mertsj
Yes. 4x^2+4x+1 Good for you.
anonymous
  • anonymous
4x^2 i mean
Mertsj
  • Mertsj
Oh I see that nikita wants to help you now. good bye
anonymous
  • anonymous
so wat one would it be
phi
  • 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

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