# 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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