Question 756392
 Find f(x+h)-f(x)
Problem 123 is: 
f(x+h) = 2(x+h)^2 + 3(x+h) -4
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2[x^2+2hx+h^2] + 3x + 3h - 4
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2x^2 + 4hx + 3x + 2h^2 + 3h - 4
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f(x+h) = 2x^2 3x + 4hx + 2h^2 + 3h -4
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f(x) = 2x^2 + 3x -4
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Subtract f(x) from f(x+h) to get:
= 4hx + 2h^2 + 3h 
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Cheers,
Stan H.