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tmua.fyi Mock Paper 2 (2) · Q20

Paper 2Algebra

For which real values of kk does the equation x4+kx2+1=0x^4+kx^2+1=0 have at least one real solution?

A∣k∣≥2\lvert k\rvert\ge2
Bk≤−2k\le-2
Ck≥2k\ge2
Dk<0k<0
Ek≤−2 or k≥2k\le-2\text{ or }k\ge2

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