-0.1x^2+80x=16000

解

- 0.1 x^{2} + 80 x = 16000

x = 400

解答ステップ

- 0.1 x^{2} + 80 x = 16000

以下で両辺を乗じる:

10

- x^{2} + 800 x = 160000

160000

を左側に移動します

- x^{2} + 800 x - 160000 = 0

解くとthe二次式

x_{1, 2} = \frac{- 800 \pm 80 0 ^{2} - 4 ( - 1 ) ( - 160000 )}{2 ( - 1 )}

80 0^{2} - 4 (- 1) (- 160000) = 0

x_{1, 2} = \frac{- 800 \pm 0}{2 ( - 1 )}

x = \frac{- 800}{2 ( - 1 )}

\frac{- 800}{2 ( - 1 )} = 400

x = 400

二次equationの解:

x = 400