## anonymous one year ago plz help will give medal Evaluate the following expression using the values given: Find −3a2 − b3 + 3c2 − 2b3 if a = 2, b = −1, and c = 3.

1. anonymous

zepdrix

2. anonymous

@whovianchick

3. anonymous

@zepdrix

4. zepdrix

$\large\rm \color{orangered}{a=2},\qquad\color{royalblue}{b=-1},\qquad\color{#A57F02}{c=3}$ $\large\rm −3\color{orangered}{a}^2 − \color{royalblue}{b}^3 + 3\color{#A57F02}{c}^2 − 2\color{royalblue}{b}^3$So plug in your values,$\large\rm −3\color{orangered}{(2)}^2 − \color{royalblue}{(-1)}^3 + 3\color{#A57F02}{(3)}^2 − 2\color{royalblue}{(-1)}^3$ And simplify! :)

5. anonymous

I got 48

6. zepdrix

$\large\rm −3(2)^2 − (-1)^3 + 3(3)^2 − 2(-1)^3$ $\large\rm −3(4) − (-1) + 3(9) − 2(-1)$ $\large\rm −12 +1 + 27 +2$ 48? Hmm that doesn't sound quite right.

7. anonymous

22 ??

8. zepdrix

$\large\rm −12 +1 + 27 +2$$\large\rm −12 +30$Hmmm 22 doesn't sound quite right either :D lol

9. anonymous

42 or -42 ?? lol

10. zepdrix

-12 + 30 is the same as 30 - 12