If you mean a polynomial such as
a(x-p)(x-q)(x-r)...
then a is the vertical scale value, so a = 1/2 means the y values are half as big: a compression ratio.
stretching and compression are just two ways of looking at a scale factor. Usually a compression means a < 1 and a stretch means a > 1, but that's just interpretation.
for function if the a value 1/2 is it a stretch of 1/2 or a compression of 2. Or is both correct!
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1 answer