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ASSIGNMENT QUESTIONS- need help with algebra equations

  1. Mar 11, 2012 #1
    i dont understand these equations and cant find a way to do them from my text book or any websites please help..

    (a) √(2^2+2 x 2+1)

    (b) -√(〖25〗^2-) 〖24〗^2

    (c) (7x +y)^2 - (7x - y)^2
     
  2. jcsd
  3. Mar 11, 2012 #2

    HallsofIvy

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    Because this are "assignment questions", I am moving this to "homework and classwork".
     
  4. Mar 11, 2012 #3

    HallsofIvy

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    Do you know what [itex]\sqrt{a^2}[/itex] is?

    This doesn't make much sense. What does [itex]\sqrt{(25)^2-}[/itex] mean?

    surely it is not that hard to square? [itex](a+ b)^2= a^2+ 2ab+ b^2[/itex].
     
  5. Mar 11, 2012 #4
    sorry i typed the equations on word and copy andpasted them, they changed format.
    i mean
    (b) -√(25^2-24^2
     
  6. Mar 11, 2012 #5
    Can you rewrite part a? I don't understand what the equation is.

    For part b) here is a clever hint: 25 = 24 + 1

    For part c) use this property: [itex](a-b)(a+b)=a^{2}-b^{2}[/itex]. Can you figure out what to do from here?
     
    Last edited: Mar 12, 2012
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