Find the values of k if 2x2 + kx +8 = 0 has real roots.
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if it has real roots ,then
D > 0
b^2-4ac >0
k^2-4×8×2>0
k^2>64
k>8
therefore k can be any value except lower than 8
it should be always greater than 8
D > 0
b^2-4ac >0
k^2-4×8×2>0
k^2>64
k>8
therefore k can be any value except lower than 8
it should be always greater than 8
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2
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