Multiply the two square roots together: 42s⋅7s=(42s)(7s). \sqrt{42s} \cdot \sqrt{7s} = \sqrt{(42s)(7s)}. 42s⋅7s=(42s)(7s).
Multiply the numbers and the variables separately: (42s)(7s)=42⋅7⋅s⋅s=294s2. (42s)(7s) = 42 \cdot 7 \cdot s \cdot s = 294s^2. (42s)(7s)=42⋅7⋅s⋅s=294s2. So, the expression becomes: 294s2. \sqrt{294s^2}. 294s2.
Factor 294294294 and s2s^2s2 to simplify: 294=49⋅6=72⋅6, 294 = 49 \cdot 6 = 7^2 \cdot 6, 294=49⋅6=72⋅6, and s2=s2. s^2 = s^2. s2=s2. Thus, the expression becomes: 72⋅6⋅s2=72⋅6⋅s2. \sqrt{7^2 \cdot 6 \cdot s^2} = \sqrt{7^2} \cdot \sqrt{6} \cdot \sqrt{s^2}. 72⋅6⋅s2=72⋅6⋅s2.
Evaluate the square roots: 72=7,s2=s,and6=6. \sqrt{7^2} = 7, \quad \sqrt{s^2} = s, \quad \text{and} \quad \sqrt{6} = \sqrt{6}. 72=7,s2=s,and6=6. Combine these results: 7⋅6⋅s=7s6. 7 \cdot \sqrt{6} \cdot s = 7s\sqrt{6}. 7⋅6⋅s=7s6.
7s6\boxed{7s\sqrt{6}}7s6
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