Question
If a - b = 5 and a^2-b^2 = 97, ab = ?
यदि a - b = 5 और a^2-b^2= 97, ab =?
A.
B.
C.
D.
Answer C.
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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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