(sqrt2+1)(3sqrt2+1)=? (please explain how to do these)

[JamesBriggs2011]

i need to check on my homework??? if someone can explain how to do these it would be appreciated

(sqrt2+1)(3sqrt2+1)=?
sqrt6(sqrt5-sqrt7)=?
sqrt(x+10)=-9 x=? or is there no solution?
(sqr(6mn))to the ninth, rewrite with rqtional exponents
sqrt(9x^)=?
(sqrt3-sqrt8)(sqrt3+sqrt8)=?
9sqrt75-6sqrt3=?

[maggiemagnet]

if someone can explain how to do these it would be appreciated

That's what the Purplemath lessons are for!

(sqrt3-sqrt8)(sqrt3+sqrt8)=?
9sqrt75-6sqrt3=?
(sqrt2+1)(3sqrt2+1)=?
sqrt6(sqrt5-sqrt7)=?

To learn how to simplify added and multiplied square-root expressions like these, try this lesson.

sqrt(x+10)=-9 x=? or is there no solution?

To learn how to solve radical equations, try this lesson.

(sqr(6mn))to the ninth, rewrite with rqtional exponents
sqrt(9x^)=?

To learn how to work with rational powers, try this page and this page.