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anonymous

  • one year ago

Choose the correct simplification of the expression -5x2(4x - 6x2 - 3). 30x4 - 20x3 + 15x2 -11x4 - x3 - 8x2 -30x4 + 20x3 - 15x2 30x4 + 20x3 + 15x2

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  1. Nnesha
    • one year ago
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    multiply everything which is inside the parentheses by outside term and when you multiply same bases you should add their exponents

  2. triciaal
    • one year ago
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    also pay attention to the signs

  3. anonymous
    • one year ago
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    i still don't understand :(

  4. Nnesha
    • one year ago
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    example a(b+c) multiply b and c by outside term which is a a times b + a times c =ab+ac

  5. Nnesha
    • one year ago
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    multiply all 3 terms 4x,-6x^2 ,-3 by -5x^2

  6. anonymous
    • one year ago
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    Will it end up negative or positve?

  7. Nnesha
    • one year ago
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    you have to multiply 2 terms if one of them is negative then answer will be negative negative times negative =positive negative times positive = negative

  8. Nnesha
    • one year ago
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    -5x^2 times 4x =??

  9. anonymous
    • one year ago
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    so this one will end up negative because the outside term is negative?

  10. anonymous
    • one year ago
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    Cant you not combine them because one has an exponent and the other doesn't

  11. Nnesha
    • one year ago
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    you will get 3 terms and all of them end up with different signs bec it also depends on inside terms

  12. Nnesha
    • one year ago
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    yes right in order to combine them you u should have same variable with same exponents x^2 +x you can't combine these both terms bec both hve different exponents

  13. Nnesha
    • one year ago
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    -5x^2 times 4x = (-5 times 4)(X^2 times x) add exponents so it should be like this x^{2+1}

  14. anonymous
    • one year ago
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    I'm so confused

  15. Nnesha
    • one year ago
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    |dw:1437425764823:dw|

  16. Nnesha
    • one year ago
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    \[-5x^2 \times 4x = what ?\]

  17. anonymous
    • one year ago
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    -20^3?

  18. Nnesha
    • one year ago
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    not -20 to the 3 power x^3

  19. anonymous
    • one year ago
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    how?

  20. Nnesha
    • one year ago
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    multiply numbers together \[\huge\rm \color{reD}{-5}x^2 \times \color{ReD}{4}x =(\color{ReD}{-5 \times 4)}x^{2+1}\]

  21. Nnesha
    • one year ago
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    x^2 times x = x^{2+1} not 20.. "=-

  22. Nnesha
    • one year ago
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    so it's -20x^3

  23. Nnesha
    • one year ago
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    now multiply by other 2 terms

  24. anonymous
    • one year ago
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    i still don't understand how your getting what your getting

  25. Nnesha
    • one year ago
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    how i got what ?

  26. Nnesha
    • one year ago
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    we have to multiply -5x^2 by all 3 terms 4x times -5x^2 -6x times -5x^2 -3 times -5x^2

  27. Nnesha
    • one year ago
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    when you multiply same bases then you should add their exponents \[\huge\rm x^m \times x^n =x^{m+n}\]

  28. Nnesha
    • one year ago
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    let me know if u r still confusd

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