How do I describe the end behavior without graphing of f(x)=1-2x^2-3x?

1 Answer
Jan 31, 2018

Read below.

Explanation:

Let's think about this with our logic.

As #x# gets really, really, large, only the variable raised to the highest power will be significant. (For example, a billion squared is a billion times larger than just a billion.)

Therefore, #1-2x^2-3x# will be almost the same as #-2x^2# as #x# gets really, really, large.

Now, when #x# is really, really, large in#-2x^2#, then the answer will be an infinitely small number.

Therefore, as #x# gets really, really large, we will get closer and closer to #-oo#

Similarly, as #x# gets really, really, small, only the variable raised to the highest power will be significant. (For example, a billionth squared is a billion times smaller than just a billionth.)

Therefore, #1-2x^2-3x# will be almost the same as #-2x^2# as #x# gets really, really, small.

Now, when #x# is really, really, small in#-2x^2#, then the answer will be an infinitely small number.

Therefore, as #x# gets really, really small, we will get closer and closer to #-oo#