How to find instantaneous rate of change for `f(x) = x^2 + 3x + 4` when x=4?

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• How do you find the instantaneous rate of change of a function at a point?
• What is Instantaneous Rate of Change at a Point?
• How do you estimate instantaneous rate of change at a point?
• How do you find the instantaneous rate of change of `f (x)= x ^2 +2 x ^4` at `x=1`?
• How do you find the instantaneous rate of change of `f(t)=(2t^3-3t+4)` when `t=2`?
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