Asked by Anonymous

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...
Answered by Steve
-9 √(28a^2) * 1/3 √(63a)
-9 * (2a√7) * 1/3 (3√(7a))
-6a √(49a)
-42a√a
Answered by Anonymous
The answer key says -126√a.
Answered by Steve
My bad. You are correct.

I dropped a 3 after the 2nd line.

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




Right?