2x^5+12x^4+16x^3-12x^2-18x+9=0

24702x + 9

Step-by-step explanation:

First, put everything you need to in parenthisis.

(2x^4) + (12x^4) + (16x^3) - (12x^2) - (18x + 9)

Then Simplifly

32x + 20736x + 4096x - 144x -18x + 9

Now Simplifly everything one by one

20768x + 4096x - 144x - 18x + 9

24864x - 144x - 18x + 9

24720x - 18x +9

24702x + 9

Now you can stop there, or solve for X by dividing each # by 24702

step-by-step explanation:

the original amount doesn't ''re just looking for the time it takes for 1/2 of the substance to we have

(1/2) =)     take the ln   of both sides

ln (1/2)   = )   and we can write

ln(1/2) = ) lne     and lne   = 1     so we have

ln(1/2) = -.1092t     divide both sides by -.1092

t = ln(1/2)/-.1092 = about 6.347 days = about 6.3 days (rounded)