Mental shortcuts have come short
When I was in 3rd to 4th grade I was informed on about the domain of linear equations for example; the carrot “>”
Which signified the direction of the of the domain for example:
x>10 showed us x is greater than 10
while x<10 is any number less than 10.
I found this does not work with complex fractions
X^2 + 5 >= 0
————
X^2 - 2 > 0
These carrots do not determine the direction of the domain as I expected as these are complex equations unlike the linear equations seen before.
So this has lead me to believe I have some mental shortcuts that are not valid anymore so I’m seeking guidance on a book for algebra and calculus and any shortcuts that you were told that don’t work anymore in either calculus or algebra.
Any clarity would be greatly appreciated.
Thank you.