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    Usually sound at these, dunno if it's me or the question, idk what to do next:






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    if it has 2 real roots, then great, but the question is indicating that the roots might also be equal , so the "greater than or equal to" in the discriminant applies.

    i.e. (k-1)^2-16 \geq 0 , => (k-1+4)(k-1-4) \geq 0

    (difference of 2 squares)

    (EDITED - mistake inside brackets!!!)
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    (Original post by Hasufel)
    if it has 2 real roots, then great, but the question is indicating that the roots might also be equal , so the "greater than or equal to" in the discriminant applies.

    i.e. (k-1)^2-16 \geq 0 , => (k-1+16)(k-1-16) \geq 0

    (difference of 2 squares)

    (EDITED)
    ...I've just spotted I misread the question as "only one real root" Thanks

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    la fin
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    you spottedi t even with my (rushed - i`m doing 1000 other thinks, apologies) stupid-ass mistake!!
 
 
 
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