Question 1015180
I am struggling with the difference of quotient problems. This one in particular f(x+h)-f(x) and this all over h

f(x)=-9x+5
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f(x+h) = -9*(x+h) + 5 = -9x-9h + 5
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f(x+h)-f(x) = -9x-9h +5 - (-9x+5) = -9h
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[f(x+h)-f(x)]/h = -9h/h = -9