If f(x) = 9 – 4|x + 1|, find f(–5).
I just need someone to make sure I did this right. I'll post my work shortly.

Question

If f(x) = 9 – 4|x + 1|, find f(–5).
I just need someone to make sure I did this right. I'll post my work shortly.

anonymous · Answer

Okay, I know I did something wrong here..
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hartnn · Answer

the order of operation is incorrect.

anonymous · Answer

you can;t 9-4 when you have to multiple the 4 to the ||

hartnn · Answer

multiplication has higher priority than subtraction

anonymous · Answer

Was I supposed to do -5+1 first or something?

hartnn · Answer

9-4(-4)
till here, its correct

anonymous · Answer

Do the || first then multiple it by 4 then subtract

hartnn · Answer

***
9-4|-4|

which is
9-4(4)

hartnn · Answer

so do 4(4) = 16 first

hartnn · Answer

=9-16=....

anonymous · Answer

Oh.. multiply the fours and then subtract. Oops.

hartnn · Answer

yes.

mathmale · Answer

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mathmale · Answer

By the way, mipie13, it helps me tremendously when you share your work with me and others who are in a position to help you.

anonymous · Answer

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hartnn · Answer

remember that |-a| = a when a is positive.

so, what can you say about |-4| =... ?

anonymous · Answer

4

anonymous · Answer

So, did I do that right?

mathmale · Answer

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