William W. answered • 12/14/20
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just plug in "7+h" everywhere there is an "x":
f(x) = x2 - 4
f(7+h) = (7+h)2 - 4
f(7+h) = 49 + 14h + h2 - 4
f(7+h) = h2 + 14h + 45
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