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spidergirl51

  • 3 years ago

(5x-8) (2x-5)

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  1. math456
    • 3 years ago
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    5x(2x-5)-8(2x-5) <-- try to solve this

  2. spidergirl51
    • 3 years ago
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    um

  3. math456
    • 3 years ago
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    use multiplication

  4. spidergirl51
    • 3 years ago
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    okay i got 10x-25 -16x+40

  5. andrea408
    • 3 years ago
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    10x^2-25x-16x+25 which would be 10x^2-41x+25

  6. math456
    • 3 years ago
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    great now solve further..

  7. johnweldon1993
    • 3 years ago
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    Correct but remember 10x is 10 x ²

  8. spidergirl51
    • 3 years ago
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    um

  9. spidergirl51
    • 3 years ago
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    idk what to do now

  10. math456
    • 3 years ago
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    yea when u multiply x's it becomes square

  11. math456
    • 3 years ago
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    x.x=x^2

  12. johnweldon1993
    • 3 years ago
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    When you multiply 2 numbers with x's the x's multiply too...which becomes x times x which is x squared...or x²

  13. spidergirl51
    • 3 years ago
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    10x2

  14. spidergirl51
    • 3 years ago
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    and then what

  15. spidergirl51
    • 3 years ago
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    what about the 16x

  16. spidergirl51
    • 3 years ago
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    -4x2

  17. math456
    • 3 years ago
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    now u hv 10x^2-41x+25.. after adding x's

  18. spidergirl51
    • 3 years ago
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    i mean -6x2

  19. johnweldon1993
    • 3 years ago
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    16x stays the same...do you have any other x's? ***you cannot combine x² and x.

  20. spidergirl51
    • 3 years ago
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    oh

  21. johnweldon1993
    • 3 years ago
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    wait perhaps I've looked wrong let me do this out

  22. spidergirl51
    • 3 years ago
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    so its 10x2 -41x+25

  23. johnweldon1993
    • 3 years ago
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    (5x-8) (2x-5) 10x² - 25x - 16x + 40 so yes 10x² -41x + 40

  24. spidergirl51
    • 3 years ago
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    i have like 13 problems like these

  25. math456
    • 3 years ago
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    did u get some idea how to do it?

  26. spidergirl51
    • 3 years ago
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    so thats your final answer

  27. math456
    • 3 years ago
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    Use the FOIL method i used above for this e.g

  28. spidergirl51
    • 3 years ago
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    (7w+5)(11w-3)

  29. math456
    • 3 years ago
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    let me do it over: 5x(2x-5)-8(2x-5) 10x^2-25x-16x+40 10x^2-41x+40

  30. spidergirl51
    • 3 years ago
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    so 77w2+55w-33w-15

  31. math456
    • 3 years ago
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    yea use the same trick with this: 7w(11w-3)+5(11w-3) <- they just replaced x with w's

  32. spidergirl51
    • 3 years ago
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    is that right

  33. math456
    • 3 years ago
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    u got first one right 7w x 3 = 21w

  34. math456
    • 3 years ago
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    so it will be 77w^2-21w+55w-15 77w^2+34w-15

  35. spidergirl51
    • 3 years ago
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    yup the next one is *b-2)(b2-b+1)

  36. math456
    • 3 years ago
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    try it..

  37. math456
    • 3 years ago
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    b(b^2-b-1)-2(b^2-b+1)

  38. spidergirl51
    • 3 years ago
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    um

  39. math456
    • 3 years ago
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    its not tht hard, give it a try

  40. spidergirl51
    • 3 years ago
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    i got 2b2-2b-1b-2b2-2b+2

  41. math456
    • 3 years ago
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    ur second part is right..

  42. spidergirl51
    • 3 years ago
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    my first part is wrong

  43. math456
    • 3 years ago
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    when u multiply bxb^2 it will be b^3

  44. spidergirl51
    • 3 years ago
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    so its b3

  45. math456
    • 3 years ago
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    right!

  46. math456
    • 3 years ago
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    same goes with the next one.. u just add power to the variable when u multiply

  47. spidergirl51
    • 3 years ago
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    so what will it look i like

  48. math456
    • 3 years ago
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    b(b^2-b-1)-2(b^2-b+1) \[b ^{3}-b ^{2}-b-2b ^{2}+2b-2\]

  49. spidergirl51
    • 3 years ago
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    can you solve that

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