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I need some help with some algebra problems please.

I don't under stand how to do that following.

Find and simplify the difference quotient f(x+h) -f(x)/h, h cannot equal 0 for the given function.

1. f(x)=5x^2

2. f(x)x^2+3x+9

  • algebra -

    The first:

    f(x+h)-f(x)= 5x^2+10hx + 5h^2-5x^2=
    10hx +5h^2

    divided by h

    10x + 5h

    as the limit of h>>0

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