Q. 4 L4.3( 27 Votes )
Let us solve :
Answer :
Let 2x + 1 = y
For y = 3,
2x + 1 = 3
⇒ 2x = 3-1
⇒ 2x = 2
⇒ x = 
= 1
For y = 1,
2x + 1 = 1
⇒ 2x = 1-1
⇒ 2x = 0
⇒ x = 0
So, x = 1 or x = 0
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