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受欢迎的代数 >

5x^2-70x+235=5*(x-a)^2-b

解答

5 x^{2} - 70 x + 235 = 5 \cdot (x - a)^{2} - b

解答

x = \frac{5 a ^{2} - b - 235}{10 ( - 7 + a )}; a \neq = 7

求解步骤

5 x^{2} - 70 x + 235 = 5 (x - a)^{2} - b

展开

5 (x - a)^{2} - b : 5 x^{2} - 10 a x + 5 a^{2} - b

5 x^{2} - 70 x + 235 = 5 x^{2} - 10 a x + 5 a^{2} - b

将

235

到右边

5 x^{2} - 70 x = 5 x^{2} - 10 a x + 5 a^{2} - b - 235

两边减去

5 x^{2} - 10 a x

5 x^{2} - 70 x - (5 x^{2} - 10 a x) = 5 x^{2} - 10 a x + 5 a^{2} - b - 235 - (5 x^{2} - 10 a x)

化简

10 a x - 70 x = 5 a^{2} - b - 235

分解

10 a x - 70 x : 10 x (a - 7)

10 x (a - 7) = 5 a^{2} - b - 235

两边除以

10 (a - 7); a \neq = 7

x = \frac{5 a ^{2} - b - 235}{10 ( - 7 + a )}; a \neq = 7

作图

流行的例子

i-j+2kb=2i-j,a=2

i - j + 2 kb = 2 i - j, a = 2

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