Question

Correct answer will get brainliest

Answer 1

$\frac{f(x+h)-f(x)}{h}=\frac{(x+h)^2-3-(x^2-3)}{h}=\\\frac{x^2+2xh+h^2-3-x^2+3}{h}=\frac{2xh+h^2}{h}=\\\frac{h(2x+h)}{h}=2x+h$

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