Find the area of the circle in simplest polynomial form. A = 3.14r^2

A. 6.28x^2 + 3.14
B. 12.56x^2 + 3.14
C. 6.28x^2 + 3.14x + 3.14
D. 12.56x^2 + 12.56x + 3.14

Question

Find the area of the circle in simplest polynomial form. A = 3.14r^2

A. 6.28x^2 + 3.14
B. 12.56x^2 + 3.14
C. 6.28x^2 + 3.14x + 3.14
D. 12.56x^2 + 12.56x + 3.14

anonymous · Answer

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mathstudent55 · Answer

Since you are given the formula for the area of a circle, just substitute r with 2x + 1.
Then you need to square 2x + 1. You can use FOIL for that. 
(2x + 1)^2 = (2x + 1)(2x + 1)
Then after FOIL, multiply every term by 3.14.