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受欢迎的代数 >

6c^2-7c-21=-1

解答

6 c^{2} - 7 c - 21 = - 1

解答

c = \frac{5}{2}, c = - \frac{4}{3}

+1

十进制

c = 2.5, c = - 1.33333 \dots

求解步骤

6 c^{2} - 7 c - 21 = - 1

将

1

para o lado esquerdo

6 c^{2} - 7 c - 20 = 0

使用求根公式求解

c_{1, 2} = \frac{- ( - 7 ) \pm ( - 7 ) ^{2} - 4 \cdot 6 ( - 20 )}{2 \cdot 6}

(- 7)^{2} - 4 \cdot 6 (- 20) = 23

c_{1, 2} = \frac{- ( - 7 ) \pm 23}{2 \cdot 6}

将解分隔开

c_{1} = \frac{- ( - 7 ) + 23}{2 \cdot 6}, c_{2} = \frac{- ( - 7 ) - 23}{2 \cdot 6}

c = \frac{- ( - 7 ) + 23}{2 \cdot 6} : \frac{5}{2}

c = \frac{- ( - 7 ) - 23}{2 \cdot 6} : - \frac{4}{3}

二次方程组的解是:

c = \frac{5}{2}, c = - \frac{4}{3}

作图

流行的例子

x^{2} - 59 = 5

x^2-4x-59=-4x+5

x^{2} - 4 x - 59 = - 4 x + 5

a^{2} x^{2} - b^{2} = 0

solvefor x,x^2+y^2=R^2

so l v e f or x, x^{2} + y^{2} = R^{2}

(x - 2) (x + 5) = 18