Posted by Ulyessus on .
My teacher said
If x2(square root xy)=94(square root 2)
so since there are two square roots
2(square root xy) equals 4(square root 2)
How is this possible, could the values be different and they are not equal.

Year 11 maths 
bobpursley,
your teacher is dead wrong.
example:
6sqrt25=15sqrt196
sqrt25 is not equal to sqrt196, ever.
Point this out to your teacher.