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=?