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受欢迎的代数 >

3x(4x+5)=7(4x+5)

解答

3 x (4 x + 5) = 7 (4 x + 5)

解答

x = - \frac{5}{4}, x = \frac{7}{3}

+1

十进制

x = - 1.25, x = 2.33333 \dots

求解步骤

3 x (4 x + 5) = 7 (4 x + 5)

将

7 (4 x + 5)

para o lado esquerdo

3 x (4 x + 5) - 7 (4 x + 5) = 0

因式分解

3 x (4 x + 5) - 7 (4 x + 5) : (4 x + 5) (3 x - 7)

(4 x + 5) (3 x - 7) = 0

使用零因数法则： If

ab = 0

then

a = 0

or

b = 0

4 x + 5 = 0 or 3 x - 7 = 0

解

4 x + 5 = 0 : x = - \frac{5}{4}

解

3 x - 7 = 0 : x = \frac{7}{3}

二次方程组的解是:

x = - \frac{5}{4}, x = \frac{7}{3}

作图

流行的例子

w^{2} - 25 = 0

5 x^{2} - 15 x + 9 = 0

solvefor x,x^2+kx+1=0

so l v e f or x, x^{2} + k x + 1 = 0

(4x+2)(x-4)=13(x-10)

(4 x + 2) (x - 4) = 13 (x - 10)

x (x - 1) = e