Question

if g(x) = x2 − 3, find g(4).

Answer 1

plug in 4 for x

Answer 2

g(x)=x^2+3 g(4)= 4^2+3=16+3

g(4)=19 (I believe)

Answer 3

@Bella<3 you copied down the function incorrectly

Answer 4

your work is correct though

Answer 5

I forgot to mention,
I am looking for a step-by-step explanation ^^''

Answer 6

Dang lol sorry lol

Answer 7

g(4)=4^2-3
16-3=13
13

Answer 8

@calculusxy, where did you get \[4^{2}\] ?

Answer 9

under the assumption that x2 = x^2

Answer 10

Oh, I see.

Answer 11

if you meant it as multiplication, then its easier to display the number before the variable like so
2x

Answer 12

Ah...
I meant to be multiplying x by 2

Answer 13

regardless, once you have made the substitution of x=4, you just follow order of operations otherwise known as pemdas or bodmas

Answer 14

This is my work:
g(4) = 4 x 2 - 3
g(4)= 8 - 3
g(4) = 5
?
What am I doing wrong?

Answer 15

nothing?
your work looks fine as is

Answer 16

Oh, Okay
Thanks so much!

Answer 17

no problem

Answer 18

But aren't you supposed to square 4?

Answer 19

@AccidentalAiChan

Answer 20

No, x2
is x times 2, not x squared

Answer 21

x2 is a completely valid method of writing 2 * x

however it is often used as x^2 simply because people do not realize that the carrot "^" is used to denote exponents, which is why when people write down quadratic equations, it is often missing the ^
@calculusxy