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SOMEONE PLEASE HELP, I'M SO CONFUSED. A sphere has a radius of 2x + 5. Which polynomial in standard form best describes the total surface area of the sphere? Use the formula S = 4π r² for the surface area
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Sep 1, 2016
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SOMEONE PLEASE HELP, I'M SO CONFUSED.
A sphere has a radius of 2x + 5. Which polynomial in standard form best describes the total surface area of the sphere? Use the formula S = 4π r² for the surface area of a sphere.
A. 16πr² + 80πx + 100π
B. 16πx² - 80πx - 100π
C. 16πx² + 80πx + 100π
D. 16πx² - 80πx + 100π
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Taking this step by step:
We can start by squaring 2x+5. Expanding (2x+5)(2x+5), we get:
Multiplying by 4pi, we then get:
This is equal to option C.
DavieDave
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Sep 7, 2016
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