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受欢迎的代数 >

-3x^2-7x+2=6

解答

- 3 x^{2} - 7 x + 2 = 6

解答

x = - \frac{4}{3}, x = - 1

+1

十进制

x = - 1.33333 \dots, x = - 1

求解步骤

- 3 x^{2} - 7 x + 2 = 6

将

6

para o lado esquerdo

- 3 x^{2} - 7 x - 4 = 0

使用求根公式求解

x_{1, 2} = \frac{- ( - 7 ) \pm ( - 7 ) ^{2} - 4 ( - 3 ) ( - 4 )}{2 ( - 3 )}

(- 7)^{2} - 4 (- 3) (- 4) = 1

x_{1, 2} = \frac{- ( - 7 ) \pm 1}{2 ( - 3 )}

将解分隔开

x_{1} = \frac{- ( - 7 ) + 1}{2 ( - 3 )}, x_{2} = \frac{- ( - 7 ) - 1}{2 ( - 3 )}

x = \frac{- ( - 7 ) + 1}{2 ( - 3 )} : - \frac{4}{3}

x = \frac{- ( - 7 ) - 1}{2 ( - 3 )} : - 1

二次方程组的解是:

x = - \frac{4}{3}, x = - 1

作图

流行的例子

0 = 4 x^{2} - 8 x - 5

solvefor D,D^2y-Dy-6y=e^{2x}

so l v e f or D, D^{2} y - Dy - 6 y = e^{2 x}

solvefor x,3x^2+4y^2-6x-24y+39=0

so l v e f or x, 3 x^{2} + 4 y^{2} - 6 x - 24 y + 39 = 0

solvefor x,x^2+2x+y^2-6y=c

so l v e f or x, x^{2} + 2 x + y^{2} - 6 y = c

completesquare Ax^2+Dx

co m pl e t es q u a re A x^{2} + D x