Question

If X+Y=11 and XY =28 , find the value of X-Y
A.2 or -2
B.3 or-3
C.4 or-4
D.5 or -5​

Answer 1

Answer:

b)3,-3

Step-by-step explanation:

(x-y)2=(x+y)2-4xy

x-y=√121-4*28

=√121-112

=√9

=+3,-3

Answer 2

Answer:

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B) 3 or -3