Question

Can someone please help me!

Answer 1

Explanation:

18. x can also become the negative integral square root of 9, which is -3.

`√(9)=-3,3`

19.

`2x-x=x\\2x=2x\\`

Here, as x is a variable, it can take any values. As its co-efficient (2) is same both in the RHS and LHS... the LHS=RHS, for any (Real) values of x