Question

Find x if f(x) = 2x + 7 and f(x) = -1.

Answer 1

If f(x) = -1 then that means you just input '-1' for 'x'.

\(f(x) = 2x + 7\)

\(f(-1) = 2(-1) + 7\)

\(f(-1) = -2 + 7\)

\(f(-1) = 5\)

Answer 2

You can give medals by clicking 'Best Response'. @livia2

Answer 3

f(-1) means you just input '-1' for 'x'. @iGreen

Answer 4

F(x) = 2x+7 and f(x) = -1
That means -1 = 2x+7
i.e 2x = -1-7
x = -4

Answer 5

?? @skullpatrol

Answer 6

Ohhh wait..

f(x) = 2x + 7
-1 = 2x + 7
-2x - 1 = 7
-2x = 8
x = -4