You can put this solution on YOUR website! if g(x) =2 - x squared , then find g(3 + h) - g(3) over h
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g(3) = 2-9 = -7
g(3+h) = 2-(3+h)^2
g(3+h) = 2-9-6h-h^2
g(3+h) = -7-6h-h^2
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Then g(3+h)-g(3) = -6h-h^2
And [g(3+h)-g(3)]/h = -6-h
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Cheers,
Stan H.