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Nullify

  • 4 years ago

Evaluate the following expression using the values given. Find 4x - y - 2z if x = -2, y = 3, and z = -2

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  1. dgo
    • 4 years ago
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    what are you having trouble with?

  2. dgo
    • 4 years ago
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    you substitute the values given for the appropriate variable then follow PEMDAS

  3. Nullify
    • 4 years ago
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    Substitute what values?

  4. dgo
    • 4 years ago
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    x = -2, y = 3, and z = -2

  5. dgo
    • 4 years ago
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    the numbers are values

  6. Nullify
    • 4 years ago
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    Ohh okay 1 sec

  7. Nullify
    • 4 years ago
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    is it 9?

  8. dgo
    • 4 years ago
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    no, first just sub the values and rewrite the full expression with the x y z

  9. dgo
    • 4 years ago
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    i mean without the x y z

  10. dgo
    • 4 years ago
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    you can rewrite it here

  11. dgo
    • 4 years ago
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    do u understand what im asking?

  12. Nullify
    • 4 years ago
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    4(-2) - 3 - 2(-2)

  13. dgo
    • 4 years ago
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    exactly! now do you know how to solve that?

  14. Nullify
    • 4 years ago
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    I do the ones in parentheses first right?

  15. dgo
    • 4 years ago
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    well parentheses come first, but here what is inside the parentheses is just a number, there nothing to do in there. so you actually do multiplication first. 4(-2) is just another way, a more clear way, of saying 4 * -2

  16. Nullify
    • 4 years ago
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    I did that and I got 8 - 3 - -4

  17. dgo
    • 4 years ago
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    4 * -2 actually equals -8

  18. Nullify
    • 4 years ago
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    Ohhhhh whoops

  19. dgo
    • 4 years ago
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    whenever you multiply a negative and a positive the answer is always negative

  20. Nullify
    • 4 years ago
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    Oh so it';s -7?

  21. dgo
    • 4 years ago
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    boom! nice job

  22. Nullify
    • 4 years ago
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    Haha, thanks!

  23. dgo
    • 4 years ago
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    :) good luck

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