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(10x - 1)^2
Does it = 100x + 1

  • math -

    Memorizing the following identities will help you with similar problems:
    (a+b)^2=a^2+2ab+b^2
    (a-b)^2=a^2-2ab+b^2

    Now put a=10x, b=1 and apply to (a-b)^2
    (10x - 1)^2
    =(10x)^2 -2(10x*))+(1)^2
    =100x²-20x+1

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