Question

For the function, f(x) =1/4 x - 2, find x if f(x) = -1.

Answer 1

Answer:

B: X = 4

Step-by-step explanation:

-1 = 1/4 X- 2

1 = 1/4 X

4 = X

Answer 2

For this case we have a function of the form $y = f (x)$, where $f (x) = \frac {1} {4} x-2$

We want to find the value of "x" when the function has the value of -1, that is, when$y = f (x) = - 1$

So:

$f (x) = \frac {1} {4} x-2 = -1\\\frac {1} {4} x-2 = -1$

We clear "x":

We add "2" to both sides of the equation:

$\frac {1} {4} x-2 + 2 = -1 + 2\\\frac {1} {4} x = 1$

We multiply by "4" on both sides of the equation:

$\frac {1} {4} x * 4 = 1 * 4\\x = 4$

So, when$y = -1$then $x = 4$

Answer:

$x = 4$