if g(x) is x^2+3x-1 find (G(x+h)-G(x))/h

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To find g(x+h), just replace x + h with all the x's you see: You should now be able to algebraically simplify the expression

All you have to do is substitute x + h into the function f, subtract f(x) from that, and then divide by h. The substitution looks like this:

do u get h^2+2xh