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受欢迎的代数 >

x^2-22x+121=13

解答

x^{2} - 22 x + 121 = 13

解答

x = 11 + 13, x = 11 - 13

+1

十进制

x = 14.60555 \dots, x = 7.39444 \dots

求解步骤

x^{2} - 22 x + 121 = 13

将

13

para o lado esquerdo

x^{2} - 22 x + 108 = 0

使用求根公式求解

x_{1, 2} = \frac{- ( - 22 ) \pm ( - 22 ) ^{2} - 4 \cdot 1 \cdot 108}{2 \cdot 1}

(- 22)^{2} - 4 \cdot 1 \cdot 108 = 213

x_{1, 2} = \frac{- ( - 22 ) \pm 2 13}{2 \cdot 1}

将解分隔开

x_{1} = \frac{- ( - 22 ) + 2 13}{2 \cdot 1}, x_{2} = \frac{- ( - 22 ) - 2 13}{2 \cdot 1}

x = \frac{- ( - 22 ) + 2 13}{2 \cdot 1} : 11 + 13

x = \frac{- ( - 22 ) - 2 13}{2 \cdot 1} : 11 - 13

二次方程组的解是:

x = 11 + 13, x = 11 - 13

作图

流行的例子

y^{2} = - 121

solvefor r,A=pi*r^2

so l v e f or r, A = π \cdot r^{2}

5x^2-43x-125=7x

5 x^{2} - 43 x - 125 = 7 x

solvefor x,x^2+3x+4=0

so l v e f or x, x^{2} + 3 x + 4 = 0

3x(2x-6)-x(x-5)=9

3 x (2 x - 6) - x (x - 5) = 9