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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.

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  1. anonymous
    • one year ago
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    zepdrix

  2. anonymous
    • one year ago
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    @whovianchick

  3. anonymous
    • one year ago
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    @zepdrix

  4. zepdrix
    • one year ago
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    \[\large\rm \color{orangered}{a=2},\qquad\color{royalblue}{b=-1},\qquad\color{#A57F02}{c=3}\] \[\large\rm −3\color{orangered}{a}^2 − \color{royalblue}{b}^3 + 3\color{#A57F02}{c}^2 − 2\color{royalblue}{b}^3\]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
    • one year ago
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    I got 48

  6. zepdrix
    • one year ago
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    \[\large\rm −3(2)^2 − (-1)^3 + 3(3)^2 − 2(-1)^3\] \[\large\rm −3(4) − (-1) + 3(9) − 2(-1)\] \[\large\rm −12 +1 + 27 +2\] 48? Hmm that doesn't sound quite right.

  7. anonymous
    • one year ago
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    22 ??

  8. zepdrix
    • one year ago
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    \[\large\rm −12 +1 + 27 +2\]\[\large\rm −12 +30\]Hmmm 22 doesn't sound quite right either :D lol

  9. anonymous
    • one year ago
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    42 or -42 ?? lol

  10. zepdrix
    • one year ago
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    -12 + 30 is the same as 30 - 12

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spraguer (Moderator)
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