Question

find the inverse of this function
f(x)= -2x-5

Answer 1

@gomathi

Answer 2

this one says, multiply by minus two, subtract five
inverse will say
add five, divide by minus two

Answer 3

just like if you were going to solve
\[-2x-5=7\] you would add 5 and get
\[-2x=12\] divide by -2 and get
\[x=-6\]

Answer 4

or you can do this, write
\[y=-2x-5\] switch \(x\) and \(y\) and write
\[x=-2y-5\] solve for \(y\)
\[x+5=-2y\]
\[\frac{x+5}{-2}=y\] and that is your inverse

Answer 5

okay i understand the last one you put where you switch x and y. thanks!

Answer 6

f=-2x-5
f+5=-2x
-(f+5)/2=x
inv 0f f=-(x+5)/2