Help me cause I'm stuck as heck

-12 and -11

Step-by-step explanation:

11^2 = 121

12^2 = 144

123 is between 121 and 144, so sqrt(123) is between 11 and 12.

-sqrt(123) is between -12 and -11.

a4 - 3a2 - 1

step-by-step explanation:

step   1   :

equation at the end of step   1   :

  ((a4) -   3a2) -   1

step   2   :

trying to factor by splitting the middle term

2.1     factoring   a4-3a2-1  

the first term is,   a4   its coefficient is   1 .

the middle term is,   -3a2   its coefficient is   -3 .

the last term, "the constant", is   -1  

the graph on the bottom right