In `nl^(x)` method , what is x ?

What is n l^(x) method ? How is it useful ?

Consider the statement : p : If x a real number such that x^3 +4x =0 then x=0 prove that p is a true statement using : (i) direct method d (ii) method of contradiction (iii) method of contrapositive

Show that the statement p: "If x is a real number such that x^3+4x=0 . then x is 0" is true by (i) direct method, (ii) method of contradiction, (iii) method of contrapositive.

Show that the statement p: ''If x is a real number such that x^(3) + 4x = 0 , then x is 0'' is true by (i) direct method, (ii) method of contradiction, (iii) method of contrapositive

Show that the statement p: ''If x is a real number such that x^(3) + 4x = 0 , then x is 0'' is true by (i) direct method, (ii) method of contradiction, (iii) method of contrapositive

Check the validity of the following compound statement using (i) direct method contrapositive method and (iii) contradiction method If x is a real number such that 4x^(3)+3x=0, " then" x=0

If x/(lm - n^(2)) = y/(mn - l^(2)) = z/(nl - m^(2)) , then show that lx + my + nz = 0 .

If x/(lm - n^(2)) = y/(mn - l^(2)) = z/(nl-m^(2)) , then prove that lx + my + nz = 0 .

In set builder method the null set is represented by {} b.varphi c.{x:x!=x} d.{x:x=x}