The difference of two squares. The number which, when multiplied together three times yields the original number.

Substitute the value of x = -3 to the equation:

Multiply the first equation by -2 gives:_
-2y = -8 + 2x
2y = 8 - 2x
adding these 2 equations:-
0 = 0
This shows that the 2 equations are equal so there are infinite solutions
Answer:
There will be 200 000 bacteria after 8 hours
Step-by-step explanation:
The crop quadruples every hour.
x represents the number of hours that pass after preparing the crop
y represents the number of bacteria after x hours.
The equation for y in function of x 3 hours after observing the crop is:

We want to know after how long there will be 200 000 bacteria.
Then we make y = 200 000 and clear x.
