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受欢迎的代数 >

r^2-8r-22=6

解答

r^{2} - 8 r - 22 = 6

解答

r = 2 (2 + 11), r = 2 (2 - 11)

+1

十进制

r = 10.63324 \dots, r = - 2.63324 \dots

求解步骤

r^{2} - 8 r - 22 = 6

将

6

para o lado esquerdo

r^{2} - 8 r - 28 = 0

使用求根公式求解

r_{1, 2} = \frac{- ( - 8 ) \pm ( - 8 ) ^{2} - 4 \cdot 1 \cdot ( - 28 )}{2 \cdot 1}

(- 8)^{2} - 4 \cdot 1 \cdot (- 28) = 411

r_{1, 2} = \frac{- ( - 8 ) \pm 4 11}{2 \cdot 1}

将解分隔开

r_{1} = \frac{- ( - 8 ) + 4 11}{2 \cdot 1}, r_{2} = \frac{- ( - 8 ) - 4 11}{2 \cdot 1}

r = \frac{- ( - 8 ) + 4 11}{2 \cdot 1} : 2 (2 + 11)

r = \frac{- ( - 8 ) - 4 11}{2 \cdot 1} : 2 (2 - 11)

二次方程组的解是:

r = 2 (2 + 11), r = 2 (2 - 11)

作图

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