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jessiegonzales

  • one year ago

MEDAL!! ALGEBRA 2 19. l-4b-8l+l-1-b^2l +2b^3;b=2

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  1. butterflydreamer
    • one year ago
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    \[\left| -4(2) - 8 \right| + \left| -1-(2)^2 \right| + 2(2)^3 \]

  2. butterflydreamer
    • one year ago
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    You are basically solving the above ^ Since they've told you that " b = 2" , this means that you just sub (plug) in 2 where the "b" is. Basically REPLACE all the "b's" with 2 and solve :) BUT you want to take note of the absolute value sign also...

  3. butterflydreamer
    • one year ago
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    So firstly, let's simplify the parts inside the first absolute sign " -4(2) - 8 " What does -4(2) - 8 = ?

  4. jessiegonzales
    • one year ago
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    -8 - 8

  5. jessiegonzales
    • one year ago
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    -16?

  6. butterflydreamer
    • one year ago
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    yes :) Now can you see how that part was BETWEEN the absolute value sign? Absolute value means you always take the POSITIVE of that value inside. So \[\left| -4(2) - 8 \right| = \left| -8-8 \right|= \left| -16 \right| = 16 \]

  7. butterflydreamer
    • one year ago
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    \[\left| -1-(2)^2 \right| = ? \]

  8. jessiegonzales
    • one year ago
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    -5

  9. butterflydreamer
    • one year ago
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    remember, you take the "absolute value" of -5... So \[\left| -1-(2)^2 \right| = \left| -5 \right| = 5 \] And now solve the last part: \[2(2)^3 = ? \]

  10. jessiegonzales
    • one year ago
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    32

  11. jessiegonzales
    • one year ago
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    i mean 24

  12. butterflydreamer
    • one year ago
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    not quite. What does \[2^3 = ? \]

  13. jessiegonzales
    • one year ago
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    16

  14. butterflydreamer
    • one year ago
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    err nope.. \[2^3 = 2\times2\times2 = ? \]

  15. jessiegonzales
    • one year ago
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    8

  16. butterflydreamer
    • one year ago
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    yes and we wanted: \[2(2)^3 = 2\times2\times2\times2 = ?\]

  17. jessiegonzales
    • one year ago
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    2(16)

  18. butterflydreamer
    • one year ago
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    2(2)^3 = 2 times 2 times 2 times 2 = 16

  19. jessiegonzales
    • one year ago
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    2^3=8

  20. butterflydreamer
    • one year ago
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    So now we solved the three parts of this equation : \[\left| -4(2) -8 \right| + \left| -1-(2)^2 \right| + 2(2)^3 \] \[= 16 + 5 + 16 = ? \]

  21. jessiegonzales
    • one year ago
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    37

  22. butterflydreamer
    • one year ago
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    correcttt

  23. jessiegonzales
    • one year ago
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    final answer is 37??

  24. butterflydreamer
    • one year ago
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    yes

  25. jessiegonzales
    • one year ago
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    thankyou zoo much

  26. butterflydreamer
    • one year ago
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    you're welcome :)

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