Current location - Training Enrollment Network - Mathematics courses - ∴f(-x+8)=f(x+8). Y=f(x+8) seen in the case study of Wang Houxiong is an even function. Why? Why not f(-x-8)=f(x+8)?
∴f(-x+8)=f(x+8). Y=f(x+8) seen in the case study of Wang Houxiong is an even function. Why? Why not f(-x-8)=f(x+8)?
Let h(x)=f(x+8)

h(-x)=f(-x+8)=h(x)=f(x+8)

Translation viewpoint

Y=f(x) is translated to the left by 8 unit lengths, and y=f(x+8) is symmetric about Y ..

So y=f(x) is symmetrical about the straight line x=8.