Show that the statement: `p : If\ x` is a real number such that `x^3+4x=0,\ t h e\ x\ i s\ 0` is true by (i)Direct method(ii). method of contradiction (iii). method of contrapositive.

Explanation

Let us assume that q : "x is a real number such that, `r : x³ + 4x = 0`" and r: "x is 0".


(i) To show that p is true, we prove "if q then r".


Therefore, let statement q be true.


`x³ + 4x = 0`


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