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anonymous

  • one year ago

simplify the expression 4(3x+2)-5(7x+5)

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  1. LynFran
    • one year ago
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    whats the 1st step? do u know?

  2. anonymous
    • one year ago
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    The x values

  3. anonymous
    • one year ago
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    combine all like terms

  4. LynFran
    • one year ago
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    how about expanding the brackets by multiplying the 4(3x+2) and -5(7x+5)

  5. LynFran
    • one year ago
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    what do u get when u expand 4(3x+2)

  6. anonymous
    • one year ago
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    12x+2?

  7. LynFran
    • one year ago
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    no 4*3x+4*2

  8. anonymous
    • one year ago
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    Ohhhhh I see 12x+8

  9. LynFran
    • one year ago
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    good now what do u get when u expand -5(7x+5)

  10. LynFran
    • one year ago
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    -5*7x+(-5)*5

  11. anonymous
    • one year ago
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    -35x+-25

  12. LynFran
    • one year ago
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    -35x-25

  13. anonymous
    • one year ago
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    Right, you don't keep the addition sign.

  14. LynFran
    • one year ago
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    so we can now write the expanded problem 12x+8-35x-25

  15. LynFran
    • one year ago
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    now group like term and simplify

  16. anonymous
    • one year ago
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    Now we combine 12x-35 and 8-25 ??

  17. LynFran
    • one year ago
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    yes 12x-35x+8-25

  18. LynFran
    • one year ago
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    now add/subtract like terms we get?

  19. anonymous
    • one year ago
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    we get -23x+-17

  20. LynFran
    • one year ago
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    -23x-17 correct

  21. anonymous
    • one year ago
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    Thank you. That addition sign will throw me off, so don't put it when you have a negative ?

  22. LynFran
    • one year ago
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    correct its like example 4x+(-1) we write 4x-1

  23. anonymous
    • one year ago
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    Ohhh I see, so I could add the addition sigh. I just need the parentheses

  24. anonymous
    • one year ago
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    sign*

  25. LynFran
    • one year ago
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    yes but it simplify and more neat when we just have 1 sign instead of 2 sign eg.. 4x^2 - 3x -6 than 4x^2 +(-3x)+(-6)

  26. anonymous
    • one year ago
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    You helped me a ton, thank you.

  27. LynFran
    • one year ago
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    welcome

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