Math

Simplify the product.

-9 sqrt 28a^2 * 1/3 sqrt 63a

I came until -3 sqrt 49a^2 * sqrt 36a, but then I got confused...

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  1. -9 √(28a^2) * 1/3 √(63a)
    -9 * (2a√7) * 1/3 (3√(7a))
    -6a √(49a)
    -42a√a

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  2. The answer key says -126√a.

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  3. My bad. You are correct.

    I dropped a 3 after the 2nd line.

    But then, you caught that when you checked my math.

    Right?

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