20. यदि समीकरण kx(x-2)+ 6 = 0 के मूल बराबर हों, तो k का मान ज्ञात कीजिए।
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Answer:
kx(x−2)+6=0
kx2−2kx+6=0
Since the roots are equal,
⇒b2 =4ac
(−2k) 2 = 4(k)(6)
4k2 = 4k(6)
∴k=6
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