The property is relatively simple, when a> is in 1, the function is increasing function, y >；; 0;
When 0; 0.
2. power function: the independent variable x is in the base position, and Y = X A (A is not equal to 1).
A is not equal to 1, but it can be positive or negative. Different values make different images and properties.
In senior high school mathematics, it is mainly to master the images when a=- 1, 2, 3 and 1/2. Where when a=2, the function is a quadratic function passing through the origin. Other A-value images can be drawn by tracing points to know the direction of the basic image.
3.Y = 8 (-0.7) is a specific numerical value, not a function, and it is ok if it is related to an exponential function or a power function. First of all, you can think of it as: exponential function y = 8 x (a = 8), when x=-0.7, the value of y; Or think of it as: power function y = x (-0.7) (a =-0.7), when x=8, the value of y.