ashley7357 wrote:simplify the expression 4ab(sqrt2b)-3a(sqrt18b^3)=7ab(sqrt6b)
I assume your question is: Simplify 4ab(sqrt(2b))-3a(sqrt(18b^3))=7ab(sqrt(6b)) In that case square both sides. The left side is of the equation is complicated but if you square it using (x - y)^2 = x^2 -2xy + y^2 you will find that for this particular question you end up with a perfect square under the root in the 2xy term. Then it is a matter of gathering like terms.