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If `x=1` is a common root of `a x^2+a x+2=0` and `x^2+x+b=0` then, `a b=` (a) 1 (b) 2 (c) 4 (d) 3

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RD SHARMA-QUADRATIC EQUATIONS-All Questions
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  5. If the equation (a^2+b^2)x^2-2(a c+b d)x+c^2+d^2=0 has equal roots, t...

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  6. If the sum of the roots of the equation x^2-x=lambda(2x-1) is zero,...

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  7. If x=1 is a common root of a x^2+a x+2=0 and x^2+x+b=0 then, a b= ...

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  13. If the sum of the roots of the equation x^2-(k+6)x+2(2k-1)=0 is equ...

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  20. The values of k for which the quadratic equation 16 x^2+4k x+9=0...

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