The function f:R→[−21,21] defined as f(x)=1+x2x, is:
Held on 2 Apr 2017 · Verified 6 Jul 2026.
Invertible
Injective but not surjective
Surjective but not injective
Neither injective nor surjective
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If the roots of x² - 5x + k = 0 are in the ratio 2:3, then k equals:
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