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受欢迎的代数 >

h^2+3h=30

解答

h^{2} + 3 h = 30

解答

h = \frac{- 3 + 129}{2}, h = \frac{- 3 - 129}{2}

+1

十进制

h = 4.17890 \dots, h = - 7.17890 \dots

求解步骤

h^{2} + 3 h = 30

将

30

para o lado esquerdo

h^{2} + 3 h - 30 = 0

使用求根公式求解

h_{1, 2} = \frac{- 3 \pm 3 ^{2} - 4 \cdot 1 \cdot ( - 30 )}{2 \cdot 1}

3^{2} - 4 \cdot 1 \cdot (- 30) = 129

h_{1, 2} = \frac{- 3 \pm 129}{2 \cdot 1}

将解分隔开

h_{1} = \frac{- 3 + 129}{2 \cdot 1}, h_{2} = \frac{- 3 - 129}{2 \cdot 1}

h = \frac{- 3 + 129}{2 \cdot 1} : \frac{- 3 + 129}{2}

h = \frac{- 3 - 129}{2 \cdot 1} : \frac{- 3 - 129}{2}

二次方程组的解是:

h = \frac{- 3 + 129}{2}, h = \frac{- 3 - 129}{2}

作图

流行的例子

2 (x - 6)^{2} + 10 = 20

5 = x^{2} - 4 x

4 p^{2} + 19 p + 12 = - 5

8 y^{2} - 24 y = 0

solvefor x,f(x+2)=x^2-2x+5

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