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domain is the numbers f(x) passes through on the x-axis, from lowest value to highest value. This function goes from -6 to 7 on x axis so you’d write that in the accepted notation (-6,7)
Range is the same principle but applied to the y-axis instead. The lowest y-value this function passed through is -3.6 (? Cant tell for sure) and the highest value looks like it’s about 5, so you’d write (-3.6,5)