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受欢迎的代数 >

(x+a)(x+5)=x^2+bx+30

解答

(x + a) (x + 5) = x^{2} + b x + 30

解答

x = \frac{30 - 5 a}{a - b + 5}; a \neq = b - 5

求解步骤

(x + a) (x + 5) = x^{2} + b x + 30

展开

(x + a) (x + 5) : x^{2} + 5 x + a x + 5 a

x^{2} + 5 x + a x + 5 a = x^{2} + b x + 30

将

5 a

到右边

x^{2} + 5 x + a x = x^{2} + b x + 30 - 5 a

两边减去

x^{2} + b x

x^{2} + 5 x + a x - (x^{2} + b x) = x^{2} + b x + 30 - 5 a - (x^{2} + b x)

化简

a x - b x + 5 x = 30 - 5 a

分解

a x - b x + 5 x : x (a - b + 5)

x (a - b + 5) = 30 - 5 a

两边除以

a - b + 5; a \neq = b - 5

x = \frac{30 - 5 a}{a - b + 5}; a \neq = b - 5

作图

流行的例子

8 - 8 (1 + 3 x) = 23 - x

1/2 (x+8)= 3/10-1/5 (x+6)

\frac{1}{2} (x + 8) = \frac{3}{10} - \frac{1}{5} (x + 6)

\frac{z}{- 1 + 2 i} = - 2 - i

5 + 3 (x - 1) = - x + 9

solvefor x,9x-2y=18

so l v e f or x, 9 x - 2 y = 18