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受欢迎的代数 >

n^2-16n=-12

解答

n^{2} - 16 n = - 12

解答

n = 2 (4 + 13), n = 2 (4 - 13)

+1

十进制

n = 15.21110 \dots, n = 0.78889 \dots

求解步骤

n^{2} - 16 n = - 12

将

12

para o lado esquerdo

n^{2} - 16 n + 12 = 0

使用求根公式求解

n_{1, 2} = \frac{- ( - 16 ) \pm ( - 16 ) ^{2} - 4 \cdot 1 \cdot 12}{2 \cdot 1}

(- 16)^{2} - 4 \cdot 1 \cdot 12 = 413

n_{1, 2} = \frac{- ( - 16 ) \pm 4 13}{2 \cdot 1}

将解分隔开

n_{1} = \frac{- ( - 16 ) + 4 13}{2 \cdot 1}, n_{2} = \frac{- ( - 16 ) - 4 13}{2 \cdot 1}

n = \frac{- ( - 16 ) + 4 13}{2 \cdot 1} : 2 (4 + 13)

n = \frac{- ( - 16 ) - 4 13}{2 \cdot 1} : 2 (4 - 13)

二次方程组的解是:

n = 2 (4 + 13), n = 2 (4 - 13)

作图

流行的例子

x (x - 11) = 0

6 x = 2 x^{2}

solvefor x,x^2y^2+4x^2-4y^2=0

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

7 r^{2} = 5 r + 2

- 4 x^{2} + 16 x - 7 = 0