? asked in Science & MathematicsMathematics · 10 years ago

(x+y)2 and the answer i got was x2+y2?

As you just read, i figured out the question.. but i know the answer is wrong! I cant find another way to get another answer!.Could you explain to me what error i did wrong and show me the proper way to do it?

9 Answers

  • 10 years ago
    Best Answer

    If that "2" meant "²", then the answer is wrong. In this case, the answer is "x² + 2xy + y²". But if it really meant 2, your answer is correct. Oh well, good luck :D

  • 10 years ago

    Well, one thing is that generally you put the number before the letter, therefore 2x + 2y

    Another thing that may have gone wrong is that you have misread the question. If the '2' was after the (x+y), (x+y) may actually be squared (the number is smaller and slightly raised next to the bracket).

    If that is the case, then just do (x+y)(x+y) which is x^2 + 2xy + y^2

    In case you didn't know, in general notation '^' means, to the power of; so x^2 means x squared

    Hope this helps!

    Source(s): School.
  • Bieber
    Lv 6
    10 years ago

    Squared means that something is multiplied by itself.. meaning:

    (x+y)^2 = (x+y) * (x+y)

    Now just distribute everything using the FOIL method if you like:

    x^2 + xy + xy + y^2, or

    x^2 + 2xy + y^2

    Have a great day! :-)

  • Ron J
    Lv 5
    10 years ago

    you have to multiply the x in one bracket by the y in the other. and the y by the other x

    so x^2 +2xy +y^2

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  • 10 years ago

    (x + y)^2, unfortunately you cannot just square both terms. Expand it, by writing:

    (x + y) * (x + y), which is equal to (x + y)^2

    Now, use the FOIL method, to multiply the First, Outer, Inner, and Last:

    First: x^2

    Outer: xy

    Inner: yx (or xy)

    Last: y^2

    Now, add them up:

    x^2 + xy + xy + y^2

    So, (x + y)^2 = x^2 + 2xy + y^2

  • cidyah
    Lv 7
    10 years ago

    (x+y)^2 =(x+y)(x+y) = x^2+xy+xy+y^2 = x^2+2xy+y^2

    2xy is missing in your answer,

  • 10 years ago

    (x+y)2 = (x+y)(x+y) = x*x+x*y+y*x+y*y =x^2+x*y+x*y+y^2 =x^2+2xy+y^2................Ans

  • Como
    Lv 7
    10 years ago

    (x + y) ² = (x + y) (x + y) = x ² + xy + xy + y ² = x ² + 2xy + y ²

  • Anonymous
    10 years ago

    Distributive Property, your answer is correct.

    Source(s): Math
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