InspectorJoe
  • InspectorJoe
(2x-7)(2x+7)
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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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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