AP calculus AB

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How does
Limit as delta x approaches 0 =
4x + 2deltax +1 simplify to 4x +1?

I'm supposed to find the derivative using the limiting process
orig equation:
f(x) 2x^2+x-1

  • AP calculus AB -

    The term

    2 delta x

    vanishes when you take the limit of delta x to zero.

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