Mathematics · 2020
JEE Main · 3 September 2020, Shift 1 · Q51
Consider the two sets: A ={ m ∈ R: both the roots of x^2-( m +1) x+ m +4=0 are real} and B=[-3,5). Which of the following is not true?
Consider the two sets :
$\displaystyle \mathrm{A}=\{\mathrm{m} \in \mathbf{R}$ : both the roots of $\displaystyle x^2-(\mathrm{m}+1) x+\mathrm{m}+4=0$ are real} and $\displaystyle B=[-3,5)$.Which of the following is not true ?
Official answer
(3)
$\displaystyle A-B=(-\infty,-3) \cup(5, \infty)$
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JEE Main 2020 Mathematics question, with the answer from NTA’s final answer key. Where our answers come from.