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If (4x^2+4kx+k=0) has equal roots, what will be the values of (k)?

Answer and explanation

Correct answer: (k=0) or (k=1)

The direct answer is A: k=0 or k=1. For 4x^2+4kx+k=0, identify a=4, b=4k, and c=k. Equal roots require D=b^2-4ac=0. Substitute: D=(4k)^2-4(4)(k)=16k^2-16k=16k(k-1). Set it equal to zero: 16k(k-1)=0. Since 16 is nonzero, k=0 or k-1=0, so k=0 or k=1. Also a=4 is never zero, so the equation remains quadratic for both values. Option A is correct. Option B omits k=0 and adds k=2. Option C adds k=4, which does not satisfy the condition. Option D includes k=-1, also not a solution. Use D=0 for equal roots.

Related tags

Quadratic EquationsNature Of RootsParameter

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