![f(x) = -x^{-2}\\\\\\f\left(-\dfrac 34 \right)\\\\\\ = - \left(-\dfrac 34 \right)^{-2}\\\\\\ = - \left[\dfrac 1{\left( -\tfrac 34 \right)^2}\right]\\\\\\=-\left(\dfrac 1{\tfrac 9{16}} \right)\\\\\\=-\left(\dfrac{16}9 \right)\\\\\\=- \dfrac{16}9](/tpl/images/2594/0414/cebdc.png)
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