यदि (a + b)= 7 और a²-b² =-1 हो, तो (a-b) =?
(a) 1/7
(b)-7
(c)-1/7
(d)-1
Answers
Answered by
0
Answer:
option b is correct
Step-by-step explanation:
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Answered by
0
Answer:
given
a+b=7
a²+b²=-1
answer
(a+b)= a²+b²+2ab
a²-b²= (a+b)(a-b)
-1=7•(a-b)
7 is in multiple
-1/7= (a-b)
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