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人気のある代数 >

25=-4.9t^2+20t+20

解

25 = - 4.9 t^{2} + 20 t + 20

解

t = \frac{5 ( 20 - 302 )}{49}, t = \frac{5 ( 20 + 302 )}{49}

+1

十進法表記

t = 0.26753 \dots, t = 3.81409 \dots

解答ステップ

25 = - 4.9 t^{2} + 20 t + 20

以下で両辺を乗じる:

10

250 = - 49 t^{2} + 200 t + 200

辺を交換する

- 49 t^{2} + 200 t + 200 = 250

250

を左側に移動します

- 49 t^{2} + 200 t - 50 = 0

解くとthe二次式

t_{1, 2} = \frac{- 200 \pm 20 0 ^{2} - 4 ( - 49 ) ( - 50 )}{2 ( - 49 )}

20 0^{2} - 4 (- 49) (- 50) = 10302

t_{1, 2} = \frac{- 200 \pm 10 302}{2 ( - 49 )}

解を分離する

t_{1} = \frac{- 200 + 10 302}{2 ( - 49 )}, t_{2} = \frac{- 200 - 10 302}{2 ( - 49 )}

t = \frac{- 200 + 10 302}{2 ( - 49 )} : \frac{5 ( 20 - 302 )}{49}

t = \frac{- 200 - 10 302}{2 ( - 49 )} : \frac{5 ( 20 + 302 )}{49}

二次equationの解:

t = \frac{5 ( 20 - 302 )}{49}, t = \frac{5 ( 20 + 302 )}{49}

グラフ

人気の例

log_{10}(5)(4x^2+4)-log_{10}(5)(x+6)=1

lo g_{10} (5) (4 x^{2} + 4) - lo g_{10} (5) (x + 6) = 1

(30-2/3 r)^2=100

(30 - \frac{2}{3} r)^{2} = 100

completesquare s^2+8s+16

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w^{2} + 6 w - 7 = 0

completesquare s^2+8s+20

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