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5. Which statement is NOT true?

If x = 1, then x2 = 1.
If x2 = 1, then x = 1.
If x= -1, then x2 = 1.
x2 = 1 if and only if x = 1 or x = -1.

User Wkf
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1 Answer

4 votes

Answer:


x^(2) =1, then\ x=1 is NOT true.

Explanation:

1.


If\ x=1, then\ x^(2) =1 ......True

( 1 )² = 1

2.

If
x^(2) =1, then\ x=1 ........ NOT True

∴ x =± 1 .........this is correct

3.


If\ x=-1, then\ x^(2) =1 ......True

( -1 )² = 1

4.

x2 = 1 if and only if x = 1 or x = -1. .........True

( 1 )² = 1

( -1 )² = 1

User JP Duffy
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5.1k points