Consider the two sets : A = {m $ \in $ R : both the roots of x2 – (m + 1)x + m + 4 = 0 are real} and B = [–3, 5). Which of the following is not true?

Question

Consider the two sets :
A = {m $ \in $ R : both the roots of
x² – (m + 1)x + m + 4 = 0 are real}
and B = [–3, 5).
Which of the following is not true?

A $ \cap $ B = {–3}

B – A = (–3, 5)

A $ \cup $ B = R

A - B = ($ - $$ \propto $, $ - $3) $ \cup $ (5, $ \propto $)

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