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soriajimmy85
23.09.2020 •
Mathematics
Find the inverse of f(x) = -5(x + 4).
A. f-1(x) = -=X - 4
-
B. 5-1(x) = - -x +
c. f-1(x) = -5(x + 4)
D. f-'(x) = 4x - 5
Solved
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Ответ:
For example lets use:
y=x+3
2y=3x-1
Since neither the y's or x's are the same, we must multiply the equations to make them the same. I am going to multiply the first equation by 2 so I can eliminate the y's.
So we get:
2y=2x+3
2y=3x-1
Then we subtract the second equation from the first to eliminate the y's. So we end up with 0=-x+4 and now we solve for x
0=-x+4
x=4
Now we plug in our x into either original to get the y-value. I am using the first
y=x+3
y=4+3
So the x=4 and y=7
Hope this helps!