What is f(-3) if f(x)=|2x-1|-5? I don't know how to do this and my homework is taking all night every night :(

A. 2
B. -12
C. 0
D. -10

Question

What is f(-3) if f(x)=|2x-1|-5? I don't know how to do this and my homework is taking all night every night :(

A. 2
B. -12
C. 0
D. -10

john_es · Answer

You have to plug in the value x=-3 in the expression of f(x). But remember that the absolute value of a number  is the positive value of the number. I mean,
$$f(-3)=|2\cdot(-3)-1|-5=|-7|-5=7-5=2$$

anonymous · Answer

well, thank you. im sorry that i always ask stupid questions on here but i always take all night to do homework every night and still get behind. my therapist says that it is probably because my brain's math level is that of a middle schooler even though im 16. i really wish i could do all these things myself -.-