Question

5. Which statement is NOT true?

Answer 1

Answer:

$x^{2} =1, then\ x=1$ is NOT true.

Step-by-step 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