Question: Use the equation f ' ( a ) = lim x a f ( x ) - f ( a ) x - a to

Use the equation f'(a)=limxaf(x)-f(a)x-a to find f'(a) at the given number a.
f(x)=x2x+30,a=6
Please show all steps of simplifiction to solve and explain. Dont solve with L'Hospital Rules, please use the definition of a derivative to solve. I get stuck on the complex fractions and evaulation of limit at a=6.
Use the equation f ' ( a ) = lim x a f ( x ) - f

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