InspectorJoe
  • InspectorJoe
(2x+3y+4)(2x+3y-4) My answer is : 4x^2+12xy+9y2-20y. ?
Algebra
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InspectorJoe
  • InspectorJoe
(2x+3y+4)(2x+3y-4) My answer is : 4x^2+12xy+9y2-20y. ?
Algebra
katieb
  • katieb
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
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LynFran
  • LynFran
when we use foil we get 2x*2x+2x*3y-(2x*4)+3y*2x+3y*3y-(3y*4)+4*2x+4*3y-(4*4) 4x^2+6xy-8x+6xy+9y^2-12y+8x+12y-16 combine like term add/subtract...
LynFran
  • LynFran
final answer 4x^2+12xy+9y^2-16
DDCamp
  • DDCamp
There's a nifty trick for expanding certain polynomials. (a+b)(a-b) = a² - b² Here, let a = 2x + 3y, and b = 4: (2x + 3y)² - 4² is a fair bit simpler to expand, isn't it?

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LynFran
  • LynFran
yep indeed @DDCamp its much easier
InspectorJoe
  • InspectorJoe
But what happen with the 8x? I'm missing something
InspectorJoe
  • InspectorJoe
Oh I fo be it and just at got
LynFran
  • LynFran
the 8x cancels out
InspectorJoe
  • InspectorJoe
Yes
LynFran
  • LynFran
im telling u that not asking you...lol
InspectorJoe
  • InspectorJoe
Lynn here is my next problem and what I came up with.. Let me know if can help.
InspectorJoe
  • InspectorJoe
Sorry I was answering lol
LynFran
  • LynFran
ok
InspectorJoe
  • InspectorJoe
(5x+2y+3)(5x+2y-3) This is what I came up with: 25x^2+20xy-15x+4y^2-6y?
InspectorJoe
  • InspectorJoe
Wait wait I gave you my incorrect answer I will give you my results right now
InspectorJoe
  • InspectorJoe
My correct answer is: 25x^2+20xy+4y^2-9
InspectorJoe
  • InspectorJoe
The -15 clear with the positive 15..
InspectorJoe
  • InspectorJoe
InspectorJoe 0 My correct answer is: 25x^2+20xy+4y^2-9
LynFran
  • LynFran
yep ur correct
InspectorJoe
  • InspectorJoe
YES
InspectorJoe
  • InspectorJoe
YEAH
InspectorJoe
  • InspectorJoe
Lol
InspectorJoe
  • InspectorJoe
Oh yes

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