Question

If f(x) = 9 – 2|x + 2|, find f(–7).
@gigi.antonia @pgpilot326

Answer 1

I just dont understand the f and x part and how I solve with them.

Answer 2

f is your function (f of x) so whenever you have f of something, you replace all of the exes with the number it tells you to. f(-7)=9-2l-7+2l

Answer 3

so 35?

Answer 4

Im so confused!

Answer 5

think of the x as being in parentheses...

in your case, \(f(x)=9-2|x+2|\) think of it like this...

\[f(x)=9-2|(x)+2|\] so whatever is in the parentheses on the left is what should be in the parenetheses on the right.

in your case...
\[f(-7)=9-2|(-7)+2|\] now just use the order of operations to resolve and get the value of f(-7).

Answer 6

9-2 is 7
then -7+ 2 is -5 but the absolute value is 5 but then what do I do?

Answer 7

work it..

f(-7)=9-2(5)

Answer 8

remember the order of operations

Answer 9

Think of the absolute value sign as parentheses

Answer 10

so -1?

Answer 11

yep... 9-10= -1

Answer 12

oh wow thanks I think I'm grasping the concept! If I need help in a few minutes will uyou be willing to help?

Answer 13

yep
should be around

Answer 14

Same here

Answer 15

ok thanks!!!!