If the expression x2 + tx + y2 is a perfect square,

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If the expression x² + tx + y² is a perfect square, then the values of t is
y² 4

(a ± b)² = a² ± 2ab + b²

If a =	x	; b =	y
	y		2

then,

± 2ab = ± 2 ×	x	×	y	± x
	y		2

∴ tx = ± x
⇒ t = ± 1

If the expression	x²	+ tx +	y²	is a perfect square, then the values of t is
	y²		4