10×√7×2×√6×√42

To simplify the expression 10×√7×2×√6×√42, start by multiplying the numbers together:

10 x 2 = 20

Now, simplify the square roots:

√7 x √6 = √(7 x 6) = √42

√42 x √42 = 42

Combine all the simplified terms:

20 x 42 = 840

Therefore, 10×√7×2×√6×√42 simplifies to 840.