Crystalneedshelp1 Crystalneedshelp1

17-06-2020
Mathematics

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The area of a circle is pi(9x2 + 6x + 1) square cm. Find an expression for the length of the circles radius

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jimrgrant1 jimrgrant1

17-06-2020

Answer:

r = 3x + 1

Step-by-step explanation:

The area (A) of a circle is calculated as

A = πr² ( r is the radius )

Here

πr² = π(9x² + 6x + 1) ← divide both sides by π

r² = 9x² + 6x + 1 ← perfect square

r² = (3x + 1)² , thus

r = 3x + 1

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