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For the following true conditional statement, write the converse. If the converse is also true, combine the statements as a biconditional.

If x = 9, then x2 = 81.

a)If x2 = 81, then x = 9.
b)If x2 = 81, then x = 9.
x2 = 81 if and only if x = 9.
c)If x2 = 9, then x = 81.
d)If x2 = 81, then x = 9.
x = 9 if and only if x2 = 81

Respuesta :

Nirina7
x2 = 81 if and only if x = 9.
this statement means 

x2 = 81 implies x = 9, and x = 9 implies x²=81
 so the converse of If x = 9, then x2 = 81 is If x2 = 81, then x = 9

The converse statement  interchange the hypothesis and the conclusion.

The converse of x=9 then [tex]x^{2} =81.[/tex]  is [tex]x^{2} = 81 then x=9.[/tex] is true.

A biconditional statement is defined to be true whenever both parts have the same truth value . combining  the statements as a biconditional we have

If [tex]x^{2}[/tex]. = 81, then x = 9.  

x = 9 if and only if [tex]x^{2} .[/tex] = 81

Option D is the right answer.

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