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f(x)= x2 -15x +9

Help plz!

What's f(a+h)-f(a) for the function

f(x)= x2 -15x +9?

asked Jul 17, 2017 in Algebra by Carl

1 Answer

You can try this one:

f(a+h) - f(a) = (a +h)2 - 15(a + h) + 9 - (a2 - 15a + 9)

                        = a2 + 2ah + h2 - 15a - 15h + 9 - a2 + 15a - 9

                        = 2ah + h2 - 15h

answered Jul 17, 2017 by Elian
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