Cooper Section $12\mathrm{.}6$ #$6$

What is a reasonable linear approximation to the function $f(x)=(3+2x)(x-4)$ for the range of $x$ values $-0\mathrm{.}1x0\mathrm{.}1?$

Hint: How big is $x^2$ in this range, compared to $x?$

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