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受欢迎的代数 >

(x+3)(x+4)=7(x+2)

解答

(x + 3) (x + 4) = 7 (x + 2)

解答

x = 2, x = - 2

+1

十进制

x = 1.41421 \dots, x = - 1.41421 \dots

求解步骤

(x + 3) (x + 4) = 7 (x + 2)

展开

(x + 3) (x + 4) : x^{2} + 7 x + 12

展开

7 (x + 2) : 7 x + 14

x^{2} + 7 x + 12 = 7 x + 14

将

12

到右边

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

将

7 x

para o lado esquerdo

x^{2} = 2

对于

x^{2} = f (a)

解为

x = f (a), - f (a)

x = 2, x = - 2

作图

流行的例子

x^2-300x-22500=0

x^{2} - 300 x - 22500 = 0

6 x^{2} - 8 x - 7 = 0

solvefor y=x^2-5x+6,x

so l v e f or y = x^{2} - 5 x + 6, x

solvefor x,f(x+5)=x^2+2x+3

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

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

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