Question
If a - b = 5 and a^2-b^2 = 97, ab = ?
यदि a - b = 5 और a^2-b^2= 97, ab =?
Answer C.
C.a - b = 5 and a^2-b^2 = 97
(a - b)^2=a^2-b^2-2ab
(5)^2=97-2ab
25=97-2ab
2ab=72
ab=36
So the correct answer is option C.
C.a - b = 5 and a^2-b^2 = 97
(a - b)^2=a^2-b^2-2ab
(5)^2=97-2ab
25=97-2ab
2ab=72
ab=36
इसलिए सही उत्तर विकल्प C है।
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