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InspectorJoe

  • one year ago

(2x-7)(2x+7)

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  1. inspectorjoe
    • one year ago
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    This is what I come up with : 4x^2+9x -9x+49?

  2. inspectorjoe
    • one year ago
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    4x^2-81+49 final results?

  3. anonymous
    • one year ago
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    7 * -7 = -49 otherwise correct. Combine like terms

  4. anonymous
    • one year ago
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    where did 81 come from?

  5. inspectorjoe
    • one year ago
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    Sorry correction final answer 4^2+49 ?

  6. inspectorjoe
    • one year ago
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    Because the middle section clear since it comes to zero right

  7. anonymous
    • one year ago
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    Right the middle clears. Should be \[4x^2-49\]

  8. anonymous
    • one year ago
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    because 7 * -7 = -49

  9. inspectorjoe
    • one year ago
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    Yes b cause a negative x a positive always equal to a negative

  10. anonymous
    • one year ago
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    right

  11. inspectorjoe
    • one year ago
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    Thanks a bunch I will attempt the next one in my one and summit here to double check my results

  12. anonymous
    • one year ago
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    ok

  13. inspectorjoe
    • one year ago
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    Okay Here is my next problem: (2x+3y+4)(2x+3y-4) My answer is : 4x^2+12xy+9y2-20y. ?

  14. anonymous
    • one year ago
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    The first three terms are right. You may have made a mistake when combining. \[(2x+3y+4)(2x+3y-4)\] \[= 2x(2x+3y-4) + 3y(2x+3y-4) + 4(2x+3y-4)\] \[=4x^2 + 6xy - 8x + 6xy + 9y^2 - 12y + 8x + 12y - 16\] \[= 4x^2 + 12xy + 9y^2 - 16\]

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