20 points if there are 520 grams of radioactive material with a half-life of 12 hours, how much of the radioactive material will be left after 72 hours? is the radioactive decay modeled by a linear function or an exponential function? a) 7.5 grams; linear b) 8.125 grams; exponential c) 12.25 grams; linear d) 16.5 grams; exponential

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  

c. side angle side. u shares the same sides