Finding X with humour

In Algebra, we apply maths principles to find out "x" the variable.

It understanding the relation of what is known to the unknown and then finding the unknown.
The fist step of the solution is in the question in Algebra.

And on the lighter side.....

In the above example they are asking us to find x, but they have told us its a right angled triangle and the pythagorus needs to be apllies. Rest is multiplication & addition!  :-)