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A compound inequality would be a combination of two or more inequalities, combined with AND or with OR. This can be implied, as in 2 < x < 5, which means: 2 < x AND x < 5.
A quadratic inequality in x is in the standard form of ax^2+bx+c(>or<)d. Ex. 3x^2+5x+1>4
Yes, It is a solution (a+)
The first is 2-dimensional, the second is 1-dimensional.