If 5a + 1 = 5, the value of 9a2 + 1is 3a25a2

Given in the question ,

5a +	1	= 5
	3a

On multiplying by	3	,
	5

3a +	1	= 5 x	3	= 3
	5a		5

On squaring both sides ,

9a² +	1	+ 2 x 3a x	1	= 9
	25a²		5a

⇒ 9a² +	1	= 9 -	6
	25a²		5

=	45 - 6	=	39
	5		5