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

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2. 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.

(difference of 2 squares)

(EDITED - mistake inside brackets!!!)
3. (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.

(difference of 2 squares)

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

Spoiler:
Show

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

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