InspectorJoe
  • InspectorJoe
(2x-7)(2x+7)
Mathematics
At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.

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InspectorJoe
  • InspectorJoe
(2x-7)(2x+7)
Mathematics
chestercat
  • chestercat
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At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.

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InspectorJoe
  • InspectorJoe
This is what I come up with : 4x^2+9x -9x+49?
InspectorJoe
  • InspectorJoe
4x^2-81+49 final results?
anonymous
  • anonymous
7 * -7 = -49 otherwise correct. Combine like terms

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anonymous
  • anonymous
where did 81 come from?
InspectorJoe
  • InspectorJoe
Sorry correction final answer 4^2+49 ?
InspectorJoe
  • InspectorJoe
Because the middle section clear since it comes to zero right
anonymous
  • anonymous
Right the middle clears. Should be \[4x^2-49\]
anonymous
  • anonymous
because 7 * -7 = -49
InspectorJoe
  • InspectorJoe
Yes b cause a negative x a positive always equal to a negative
anonymous
  • anonymous
right
InspectorJoe
  • InspectorJoe
Thanks a bunch I will attempt the next one in my one and summit here to double check my results
anonymous
  • anonymous
ok
InspectorJoe
  • InspectorJoe
Okay Here is my next problem: (2x+3y+4)(2x+3y-4) My answer is : 4x^2+12xy+9y2-20y. ?
anonymous
  • anonymous
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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