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Sarah_Miller720

I need help figuring out this equation. 7(2b – 5) + 3 = 10

  • one year ago
  • one year ago

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  1. merpersmeeps
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    I think it would be 14b - 35 +3 = 10 so, 14b-38=10 14b=48

    • one year ago
  2. JayDS
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    yes what merp has shown is correct, but do u understand it? 1) Always expand out the brackets first. then collect like terms and rearrange to solve for your unknown.

    • one year ago
  3. Sarah_Miller720
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    so my answer would be b=3 then right?

    • one year ago
  4. JayDS
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    nope. try again.

    • one year ago
  5. Sarah_Miller720
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    okay give me a minute

    • one year ago
  6. JayDS
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    the figure is right but it's not exactly 3, can you see that 14 is not a factor of 48? so it can't be a whole number.

    • one year ago
  7. Sarah_Miller720
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    b=42?

    • one year ago
  8. JayDS
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    nono.

    • one year ago
  9. JayDS
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    7(2b – 5) + 3 = 10 expand brackets. 14b - 35 + 3 = 10 collect like terms. 14b -32 = 10 bring -32 over to RHS 14b = 10+32 14b = 42 solve for b using inverse of operation 14 times b = 42 b = 42 divided by 14

    • one year ago
  10. JayDS
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    merp, who showed u the working above, made an error so follow my working out.

    • one year ago
  11. Sarah_Miller720
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    i got 3

    • one year ago
  12. JayDS
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    u are right.

    • one year ago
  13. Sarah_Miller720
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    lol i asked you if it was 3 above and you said no..

    • one year ago
  14. JayDS
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    sorry, I was following merp's working out.

    • one year ago
  15. JayDS
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    and I just figured out her working out was wrong just then when I showed u my solution.

    • one year ago
  16. Sarah_Miller720
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    that's ok :)

    • one year ago
  17. JayDS
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    :) at least u understand how to do it.

    • one year ago
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