x+y=7 এবং xy=10 হলে (x-y)2 -এর মান কত?
Solution
Correct Answer: Option C
দেওয়া আছে,
x+y=7 এবং xy=10
(x+y)2=(x-y)2+4xy
or,72=(x-y)2+4×10
or,49=(x-y)2+40
or,9=(x-y)2
∴ (x-y)2=9
x+y=7 এবং xy=10
(x+y)2=(x-y)2+4xy
or,72=(x-y)2+4×10
or,49=(x-y)2+40
or,9=(x-y)2
∴ (x-y)2=9
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