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For what value(s) of k the quadratic equ...

For what value(s) of k the quadratic equation `x^(2)+kx+1=0` can be factorised into a product of real linear factors?

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For an equation, to be factorised into a product of real linear factors,
`Dgt=0`
`:.k^(2)-4(1)(1)gt=0`
`impliesk^(2)gt=4`
`:.kgt=2orkle-2`
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