Question

Evaluate the expression below when x = 9.
3x + 2x2 - 9

A) 54
B) 180
C) 342
D) 4,365

Answer 1

Never mind I got it, it is 180 thank you though! @tbl

Answer 2

you must replace the x with 9 so it would become 3(9) + 2(9)^2 - 9
then you'd mutiply the parathethesis, which would make it 27 + 18^2 - 9
then you would do the exponets which would mean 18 * 18 which would make it 324
the problem would then change to 27 + 324 - 9 you would then do the logical thing add and subtract.
27 + 324 which would become 351 then you'd minus 9 which would make it 342 which would make your answer C

Answer 3

oh I got 180

Answer 4

erm how?

Answer 5

would you like explain your steps?

Answer 6

herm i don't see how you could get 180...

Answer 7

is that x squared, or times 2?

Answer 8

haha I don't know I think I must have added or subtracted it wrong but already put it in and cant go back thank you though @tbl

Answer 9

its x squared

Answer 10

rawr should have let me finished tina! but good try!

Answer 11

\[3x + 2x ^{2} - 9 = Z\]
\[3(9) + 2(9) ^{2} - 9 = Z\]
\[27+ 324 - 9 = Z\]
\[351 - 9 = Z\]
\[342 = Z\]

Answer 12

what's with the z
and that's what i said already

Answer 13

thank you! @RockerSk8er I see my mistake.

Answer 14

guess my explnation didn't help but good job @RockerSk8er

Answer 15

lol I meant it as you already explained it to me and I understood it already! @tbl

Answer 16

thank you both though ♥ @tbl @RockerSk8er

Answer 17

welcome tina! and any time you need help just tag me in

Answer 18

I just added Z to represent the final number. Not that yours didn't say it all, I just put it into an expression. :)
You're welcome @tinasanchez

Answer 19

ok thanks @tbl

Answer 20

erm your welcome..:)?