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受欢迎的代数 >

4x^2-19x-30=0

解答

4 x^{2} - 19 x - 30 = 0

解答

x = 6, x = - \frac{5}{4}

+1

十进制

x = 6, x = - 1.25

求解步骤

4 x^{2} - 19 x - 30 = 0

使用求根公式求解

x_{1, 2} = \frac{- ( - 19 ) \pm ( - 19 ) ^{2} - 4 \cdot 4 ( - 30 )}{2 \cdot 4}

(- 19)^{2} - 4 \cdot 4 (- 30) = 29

x_{1, 2} = \frac{- ( - 19 ) \pm 29}{2 \cdot 4}

将解分隔开

x_{1} = \frac{- ( - 19 ) + 29}{2 \cdot 4}, x_{2} = \frac{- ( - 19 ) - 29}{2 \cdot 4}

x = \frac{- ( - 19 ) + 29}{2 \cdot 4} : 6

x = \frac{- ( - 19 ) - 29}{2 \cdot 4} : - \frac{5}{4}

二次方程组的解是:

x = 6, x = - \frac{5}{4}

作图

流行的例子

2 x^{2} + x = 22 x + 11

2 x^{2} - 5 x = 33

solvefor x,5x^2+5y^2-9x-14y+26=0

so l v e f or x, 5 x^{2} + 5 y^{2} - 9 x - 14 y + 26 = 0

solvefor s,3as^2-an^2=0

so l v e f or s, 3 a s^{2} - a n^{2} = 0

completesquare 4-2x-x^2

co m pl e t es q u a re 4 - 2 x - x^{2}