The negative value on the x axis represents the whole graph. When you add 3, the whole graph shifts up three units. This is further explained below.
What is transformations?
Generally, an operation that changes the value of one number, expression, or function into another of the same kind.
In conclusion, With a 2 in front of the sine, the vertical range of the graph is multiplied by 2. The negative value on the x-axis represents the whole graph. When you add 3, the whole graph shifts up three units.
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