Question

hey friends .

can anyone explain me this step ?

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Answer 1

Answer:

${k}^{2} - 24 \geqslant 0 \\ {k}^{2} \geqslant 24 \\ k \geqslant \sqrt{24} \\ k \geqslant \sqrt{2 \times 2 \times 2\times 3} \\ k \geqslant 2 \sqrt{2 \times 3} \\ k \geqslant 2 \sqrt{6}$

Hope it helps...