Question

hi
how do calculate the coordinates for a vertical stretch and how doy ou find the new coordinates of a vertical compression in quadratic functions

Answer 1

Considering a quadratic equation as a transformation of the graph of
y = x^2
we get
A(x-b)^2 +c
b and c are the shift.
c moves the whole graph up or down if it is negative.
b moves the whole graph right or left if it is negative.
A is what stretches or compresses the function.
If A is greater than 1, all the y values are increased, so it stretches it up.
If A is less than 1, all of the y values are decreased, so it compresses it down.
If A is negative, the whole graph gets flipped vertically.

Answer 2

by how much does the y values and x values increase and decrease