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How to write the fourth question in the format of the big math book (1) (2) (3) (I can't write these questions either)
4( 1)y=x? -4

The opening is upward, and y has the minimum value: ymin=-4.

y∈[-4,+∞)

(2)y=2/x

x≠0

x∈(-∞,0)U(0,+∞)

(3)3x >= 4-2 times

5x & gt=4

x & gt=4/5

x∈[4/5,+∞)