Determine whether these are valid arguments.

Question

a. If x is a positive real number, then x2 is a positive real number. Therefore, if a2 is
positive, where a is a real number, then a is a positive real number.
b. Ifx2 ≠0,wherexisarealnumber,thenx≠0.Letabearealnumberwitha2 ≠0;then
a ≠ 0.

Answer 1

It would help if you proofread your questions before you posted them. Spaces?

Online "^" is used to indicate an exponent, e.g., x^2 = x squared.