If 1.5x = 0.04y, then the value of y2 − x2 is

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1.5x = 0.04y

⇒	x	=	0.04	=	4	=	2
	y		1.5		150		75

⇒	y	=	75
	x		2

Now,	y² − x²
	y² + 2xy + x²

=	(y − x)(y + x)
	(y + x)²

=	y − x
	y + x

=	73
	77

If 1.5x = 0.04y, then the value of	y² − x²	is
	y² + 2xy + x²