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受欢迎的代数 >

q^2+3q-19=-5

解答

q^{2} + 3 q - 19 = - 5

解答

q = \frac{- 3 + 65}{2}, q = \frac{- 3 - 65}{2}

+1

十进制

q = 2.53112 \dots, q = - 5.53112 \dots

求解步骤

q^{2} + 3 q - 19 = - 5

将

5

para o lado esquerdo

q^{2} + 3 q - 14 = 0

使用求根公式求解

q_{1, 2} = \frac{- 3 \pm 3 ^{2} - 4 \cdot 1 \cdot ( - 14 )}{2 \cdot 1}

3^{2} - 4 \cdot 1 \cdot (- 14) = 65

q_{1, 2} = \frac{- 3 \pm 65}{2 \cdot 1}

将解分隔开

q_{1} = \frac{- 3 + 65}{2 \cdot 1}, q_{2} = \frac{- 3 - 65}{2 \cdot 1}

q = \frac{- 3 + 65}{2 \cdot 1} : \frac{- 3 + 65}{2}

q = \frac{- 3 - 65}{2 \cdot 1} : \frac{- 3 - 65}{2}

二次方程组的解是:

q = \frac{- 3 + 65}{2}, q = \frac{- 3 - 65}{2}

作图

流行的例子

solvefor x,w=-3x^2+5

so l v e f or x, w = - 3 x^{2} + 5

q^{2} - 30 q + 200 = 0

x (x + 2) = 2 x + 25

x^{2} + 3 x = 8 x - 6

3 x^{2} - 5 = 11