Question 324333
sqrt{7a} + 2(sqrt{175a^3}) = 

sqrt{7a} + 2*sqrt{25}*sqrt{7}*sqrt{a^2}*sqrt{a} =

sqrt{7a} + 10a*sqrt{7a}

Both radicals cannot be added because although both have the same radicand, one has 10a and the other does not.

Final answer: sqrt{7a} + 10a*sqrt{7a}