74. If x + y = a - b and x - y = a + b , then xy is ??
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Answered by
2
X+y=a-b=> 1
X-y=a+b=> 2
2x= 2a
X= a
1=> a+y= a-b
Y+b= a-a
Y+b= 0
Y= -b
Xy= a x -b
-ab
Hope it helps... please mark as brainliest
X-y=a+b=> 2
2x= 2a
X= a
1=> a+y= a-b
Y+b= a-a
Y+b= 0
Y= -b
Xy= a x -b
-ab
Hope it helps... please mark as brainliest
Answered by
3
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