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14 November, 18:27

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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  1. 14 November, 18:35
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    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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