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anonymous

  • one year ago

Can someone help me out? 2. Evaluate the expression for a = –1 and b = 5. Show your work. 5a – 7b + b^2 This is how i solved it i'm just seeing if i did it right or if i messed up somewhere throughout the problem 5+ -1 -7(5) + (5)^2 -35 25 4+ -35 25 4+ -35 = -31 -31+ 25 = -6

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  1. AbdullahM
    • one year ago
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    You messed up.

  2. AbdullahM
    • one year ago
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    \(\sf\Large 5a – 7b + b^2\) where \(\sf\Large a=-1 \\\sf\Large b=5\)

  3. AbdullahM
    • one year ago
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    So simply just plug in the numbers: \(\sf\Large 5(-1) -7(5)+(5)^2=?\)

  4. AbdullahM
    • one year ago
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    Remember, it's multiplication we are doing. Not addition or subtraction.

  5. anonymous
    • one year ago
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    Alright is this correct 5+( -1) -7(5) + (5)^2 -35 25 - 5 -35 25 -5+ -35 = 40 -40+ 25 = 15

  6. AbdullahM
    • one year ago
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    almost correct, but \(\sf\Large -40+25 = \color{red}{-}15\) because \(\sf\Large -40+25 = 25-40\)

  7. anonymous
    • one year ago
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    5+( -1) -7(5) + (5)^2 -35 25 - 5 -35 25 -5+ -35 = -40 25 + -40 = 15 How about now?

  8. AbdullahM
    • one year ago
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    you have all the steps correct except the last one \(\sf\Large 25+ (-40) = -15\) \(\sf\Large -40 + 25 = -15\) It's \(\bf \color{red}{-}\)15 It's a negative 15...

  9. anonymous
    • one year ago
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    Oh didn't notice that >~< I'm sorry.

  10. AbdullahM
    • one year ago
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    It's ok, we should learn from our mistakes. :) And Welcome to OpenStudy! @Ashtaroth

  11. anonymous
    • one year ago
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    Thanks. I think this place is going to help me big time with my algebra.

  12. anonymous
    • one year ago
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    Could you help me with another?

  13. AbdullahM
    • one year ago
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    sure close this question and post another question :)

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