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受欢迎的代数 >

-3x^2-99=-42x

解答

- 3 x^{2} - 99 = - 42 x

解答

x = 3, x = 11

求解步骤

- 3 x^{2} - 99 = - 42 x

将

42 x

para o lado esquerdo

- 3 x^{2} - 99 + 42 x = 0

改写成标准形式

a x^{2} + b x + c = 0

- 3 x^{2} + 42 x - 99 = 0

使用求根公式求解

x_{1, 2} = \frac{- 42 \pm 4 2 ^{2} - 4 ( - 3 ) ( - 99 )}{2 ( - 3 )}

4 2^{2} - 4 (- 3) (- 99) = 24

x_{1, 2} = \frac{- 42 \pm 24}{2 ( - 3 )}

将解分隔开

x_{1} = \frac{- 42 + 24}{2 ( - 3 )}, x_{2} = \frac{- 42 - 24}{2 ( - 3 )}

x = \frac{- 42 + 24}{2 ( - 3 )} : 3

x = \frac{- 42 - 24}{2 ( - 3 )} : 11

二次方程组的解是:

x = 3, x = 11

作图

流行的例子

u^{2} - 6 u + 1 = 0

z^{2} - 3 z - 11 = - 6 z

-75x^2-15x-100=-150x^2+10x+250

- 75 x^{2} - 15 x - 100 = - 150 x^{2} + 10 x + 250

- 2 x^{2} - x - 6 = 0

solvefor x,-3^2+x^2=10^2

so l v e f or x, - 3^{2} + x^{2} = 1 0^{2}