Question

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.

Answer 1

zepdrix

Answer 2

@whovianchick

Answer 3

@zepdrix

Answer 4

\[\large\rm \color{orangered}{a=2},\qquad\color{royalblue}{b=-1},\qquad\color{#A57F02}{c=3}\]

\[\large\rm −3\color{orangered}{a}^2 − \color{royalblue}{b}^3 + 3\color{#A57F02}{c}^2 − 2\color{royalblue}{b}^3\]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! :)

Answer 5

I got 48

Answer 6

\[\large\rm −3(2)^2 − (-1)^3 + 3(3)^2 − 2(-1)^3\]
\[\large\rm −3(4) − (-1) + 3(9) − 2(-1)\]
\[\large\rm −12 +1 + 27 +2\]

48? Hmm that doesn't sound quite right.

Answer 7

22 ??

Answer 8

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

Answer 9

42 or -42 ?? lol

Answer 10

-12 + 30 is the same as 30 - 12