What are the factors of x² + 3x - 4?
2 answers:
Answer:
(x + 4) and (x - 1)
Step-by-step explanation:
x² + 3x - 4
You want to look for what numbers can be multiplied in order to get the 3rd number (the -4) that can also add/subtract to the middle number (the 3)
simply,
(4)(-1) = -4
(4) -1 = 3
to make sure you can also reverse it and if you get to the same thing that you started with it is correct.
(check photo)
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Answer:
Rate of Decay = 8%
Step-by-step explanation:
The decay formula is:
Where F is the final value (here, it is given as "Y")
P is the initial value (here, given as 20,000)
r is the rate of decay (what we need to find)
t is the time (given as 2)
Comparing both the equations:
We see that:
1 - r =0.92
We solve for "r":
1 - 0.92 = r
0.08 = r
The rate of decay is 0.08, as a percentage, we need to multiply by 100, so we have:
0.08 * 100 = 8%
Rate of Decay = 8%