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Maths Help please needed... algebraic expressions!! Watch

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    Hi everyone, come on here as a last resort as I have my maths exams on 10th Jan and I am failing miserably at studying and revising for them. I am self teaching and the book i have pressumes a lot of prior maths knowledge which I just dont have.

    I have no idea how to do simple things like manipulate an algebraic expression... the example in my book says

    y=5+(x-3)^2
    y=5+(x^2-3x-3x+9)
    =5+x^2-6x+9
    =x^2-6x+14

    I just dont know how it has arrived at this at all, it doesnt tell you and assumes you can see how the process is acheived.. I cannot and am feeling very much out of my depth here! where has the 9 come from? I havent got a clue about expanding out brackets, tried ages to work it out myself!!
    Also what is meant by factorising expressions... im completely lost and would appreciate any help at all. :confused:
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    5+ (x-3)^2

    Multiply out the brackets as it says squared , which would then open up more terms which will get you your answer.
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    It looks like you're struggling with expanding brackets.

    Do you know, for example, how to expand (x+2)(x-1)? Or, more generally, (a+b)(c+d)?
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    This is how you multiply:

    (a+b)(c+d) = ac+ad+bc+bd
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    i hope this helps,
    sorry if the image is large.

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    (Original post by everytingisinvalid)
    i hope this helps,
    sorry if the image is large.

    Thanks sooo much - get it now, knew it would be staring straight at me
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    (Original post by struggling...)
    Thanks sooo much - get it now, knew it would be staring straight at me
    it's okaaaaay i hope you do well in your exam
 
 
 
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