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受欢迎的代数 >

(4x+3)(x+1)=2

解答

(4 x + 3) (x + 1) = 2

解答

x = \frac{- 7 + 33}{8}, x = \frac{- 7 - 33}{8}

+1

十进制

x = - 0.15692 \dots, x = - 1.59307 \dots

求解步骤

(4 x + 3) (x + 1) = 2

展开

(4 x + 3) (x + 1) : 4 x^{2} + 7 x + 3

4 x^{2} + 7 x + 3 = 2

将

2

para o lado esquerdo

4 x^{2} + 7 x + 1 = 0

使用求根公式求解

x_{1, 2} = \frac{- 7 \pm 7 ^{2} - 4 \cdot 4 \cdot 1}{2 \cdot 4}

7^{2} - 4 \cdot 4 \cdot 1 = 33

x_{1, 2} = \frac{- 7 \pm 33}{2 \cdot 4}

将解分隔开

x_{1} = \frac{- 7 + 33}{2 \cdot 4}, x_{2} = \frac{- 7 - 33}{2 \cdot 4}

x = \frac{- 7 + 33}{2 \cdot 4} : \frac{- 7 + 33}{8}

x = \frac{- 7 - 33}{2 \cdot 4} : \frac{- 7 - 33}{8}

二次方程组的解是:

x = \frac{- 7 + 33}{8}, x = \frac{- 7 - 33}{8}

作图

流行的例子

化简 1-(1/2)^4

s im pl i f y 1 - (\frac{1}{2})^{4}

longdivision 1/(0.00353)

l o n g d i v i s i o n \frac{1}{0.00353}

x^{2} + 6 x = 7

2 x^{2} = - 3 x - 1

7 x^{2} - 3 x = 3