Question

Evaluate the expression r^3+4r^2s for r=-2 and s=3.

The solution is .

Answer 1

\(\normalsize\color{blue}{ r^3+4r^2s }\)
\(\normalsize\color{blue}{ (-2)^3+4(-2)^2(3) }\)

Answer 2

simply plug in the variables

Answer 3

\(\normalsize\color{blue}{ -8+4(4)(3) }\)
\(\normalsize\color{blue}{ =? }\)

Answer 4

-4+12?

Answer 5

Mhm?

Answer 6

What is \[4 \times 4 \times 3? \]

Answer 7

48?

Answer 8

Yes, now what's 48-8?

Answer 9

40

Answer 10

:)

Answer 11

thats not it..ughh

Answer 12

Yes it is, it is 40 :)

Answer 13

i tried it

Answer 14

That's because you gave us the wrong value for r....it's -3 not -2 haha.

Answer 15

and s =2, you had it backwards

Answer 16

haha omgi swear i copied and pasted.. hmm they must've switched it to trick me

Answer 17

\[r^3+4r^2s \implies (-3)^3+4(-3)^2(2)\]

Answer 18

-27 + 4(9) (2)?

Answer 19

Yeah

Answer 20

-27+72?

Answer 21

45

Answer 22

It's arithmetic you shouldn't have to ask me :P, but yes that's right.