anonymous
  • anonymous
Find the area of the circle in simplest polynomial form. A = 3.14r2 2x+1 a: 6.28x2 + 3.14 b: 12.56x2 + 3.14 c: 6.28x2 + 3.14x + 3.14 d: 12.56x2 + 12.56x + 3.14
Mathematics
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SOLVED
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schrodinger
  • schrodinger
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anonymous
  • anonymous
What one you think?
anonymous
  • anonymous
A
Nurali
  • Nurali
A = 3.14r^2 since r = 2x+1 A = 3.14(2x+1)^2 Now all you have to do is simplify this expression. A=3.14(2x+1)(2x+1) A=3.14(4x^2 + 2x + 2x + 1) A=3.14(4x^2 +4x+1) A=12.56x^2 + 12.56x + 3.14

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welshfella
  • welshfella
Oh yes - i didn't understand the question at first you didnt say that r = 2x + 1
anonymous
  • anonymous
i don't know how to do that
welshfella
  • welshfella
the answers not A
welshfella
  • welshfella
Nurali has worked it out for you
welshfella
  • welshfella
you just say A = 3.14 r^2 when r = 2x + 1
anonymous
  • anonymous
is it B
anonymous
  • anonymous
i really don't understand how to do this stuff
anonymous
  • anonymous
hello?
welshfella
  • welshfella
its basic algebra you replace the r in 3.14 r^2 by 2x + 1 and simplify

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