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anonymous

  • one year ago

hat is the value of the expression when a = 5 and b = 3? 4a^2 5b^3 A. 55 B. 74 C. 81 D. 145

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  1. anonymous
    • one year ago
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    @jim_thompson5910 pls help

  2. anonymous
    • one year ago
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    @jim_thompson5910 pls help

  3. jim_thompson5910
    • one year ago
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    Replace 'a' in 4a^2*5b^3 with 5 so we have 4*5^2*5b^3

  4. jim_thompson5910
    • one year ago
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    also replace b with 3 to get 4*5^2*5*3^3 I'll let you finish

  5. anonymous
    • one year ago
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    okay 100-45=55?

  6. jim_thompson5910
    • one year ago
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    oh the original expression is \[\Large 4a^2 - 5b^3\] ??

  7. anonymous
    • one year ago
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    right

  8. jim_thompson5910
    • one year ago
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    I'm not sure how you got 45

  9. jim_thompson5910
    • one year ago
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    oh I see. You did 3*3 = 9 when you should have done 3^3 = 3*3*3 = 27

  10. jim_thompson5910
    • one year ago
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    try it again

  11. anonymous
    • one year ago
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    its 55 thanks tho

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