समीकरण (4x-2-2(5k-1)x+(k+2)2=0) के समान मूलों के लिए सही समीकरण कौन सा है?
Which equation is correct for equal roots of (4x-2-2(5k-1)x+(k+2)2=0)?
Explanation opens after your attempt
A. \(21k^2-18k-15=0\)
Concept
Here (D=4(5k-1)2-16(k+2)2=4\(21k^2-18k-15\)). For equal roots the inner part becomes (0).
Why this answer is correct
The correct answer is A. \(21k^2-18k-15=0\). Here (D=4(5k-1)2-16(k+2)2=4\(21k^2-18k-15\)). For equal roots the inner part becomes (0).
Exam Tip
यहाँ (D=4(5k-1)2-16(k+2)2=4\(21k^2-18k-15\)) है। समान मूलों के लिए अंदर वाला भाग (0) होगा।
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