Michael K. answered • 04/26/19
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The particular function in question f(h) = 16 - 81h2 is the difference of two squares...
a2 - b2 = (a + b)(a - b)
16 = 42
81h2 = (9h)2
Therefore we can write f(h) = (4 + 9h)(4 - 9h)
