Whakaoti i te 2({left(-5/4right)}^2+5(-5/4)-7

$$2( { \left( \frac{ -5 }{ 4 } \right) }^{ 2 } +5( \frac{ -5 }{ 4 } )-7$$

Aromātai

$$-\frac{187}{8}=-23.375$$

Ngā Upane Otinga

Ka taea te hautanga \frac{-5}{4} te tuhi anō ko -\frac{5}{4} mā te tango i te tohu tōraro.

$$2\left(\left(-\frac{5}{4}\right)^{2}+5\times \frac{-5}{4}-7\right)$$

Tātaihia te -\frac{5}{4} mā te pū o 2, kia riro ko \frac{25}{16}.

$$2\left(\frac{25}{16}+5\times \frac{-5}{4}-7\right)$$

Ka taea te hautanga \frac{-5}{4} te tuhi anō ko -\frac{5}{4} mā te tango i te tohu tōraro.

$$2\left(\frac{25}{16}+5\left(-\frac{5}{4}\right)-7\right)$$

Whakareatia te 5 ki te -\frac{5}{4}, ka -\frac{25}{4}.

$$2\left(\frac{25}{16}-\frac{25}{4}-7\right)$$

Tangohia te \frac{25}{4} i te \frac{25}{16}, ka -\frac{75}{16}.

$$2\left(-\frac{75}{16}-7\right)$$

Tangohia te 7 i te -\frac{75}{16}, ka -\frac{187}{16}.

$$2\left(-\frac{187}{16}\right)$$

Whakareatia te 2 ki te -\frac{187}{16}, ka -\frac{187}{8}.

$$-\frac{187}{8}$$

Tauwehe

$$-\frac{187}{8} = -23\frac{3}{8} = -23.375$$