1. ## need help with radicals

how can i solve this? help please

1)1/4 x√3y - 3/2 x√3y

2) √50x^2y^5 - 13y√2x^2y^3 + xy√98y^3

2. I'm going to assume that they're asking you to simplify:
1.
a. Given: 1/4 x√3y - 3/2 x√3y
b. Combine fractions: (x√3y)/4 - (6x√3y)/4 = (-5x√3y/4)

2.
a. Given: √50x^2y^5 - 13y√2x^2y^3 + xy√98y^3
b. Factor: √(2*5^2*x^2*y^4*y) - 13y√(2*x^2*y^2*y) + xy√(2*7^2*y^2*y)
c. Take 'em out: 5xy^2√2y - 13xy^2√2y + 7xy^2√2y
d. Combine: -xy^2√2y

3. Hello, DDuNsT!

Here's my approach to #2 . . .

. . . . . . . . . . . .________ . - - . ._______ . . . .____
Simplify: .(2) . √50·x²·y^5 - 13y√2·x²·y³ + xy√98·y³

. - - . . . . . . .________ . . . . . ___________ . . . . . _____________
First term: . √50·x²·y^5 . = . √25·2·x²·y^4·y . = . √(25·x²·y^4)(2y)
. . . . . ._________ . .__ . . - - . . . .__
. . = . √25·x²·y^4 · √2y . = . 5xy²√2y

. . . . . . . . . . . . . . .______ . . . . . . . .________ . . . . . . . .________
Second term: . -13y√2·x²·y³ . = . -13y√2·x²·y²·y . = . -13y√(x²y²)(2y)
. . . . . . . . . . .__ . . - - . . . . . __
. . = . -13y·xy√2y . = . -13xy²√2y

. - - . . . . . . . . ____ . . . . . . ________ . - - . . ._________
Last term: . xy√98y³ . = . xy√49·2·y²·y . = . xy√(49y²)(2y)
. - - . . . . . . __ . - . . . . . .__
. . = . xy·7y√2y . = . 7xy²√2y

Now combine the three terms . . .