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受欢迎的代数 >

-5c^2+4=-81

解答

- 5 c^{2} + 4 = - 81

解答

c = 17, c = - 17

+1

十进制

c = 4.12310 \dots, c = - 4.12310 \dots

求解步骤

- 5 c^{2} + 4 = - 81

将

4

到右边

- 5 c^{2} = - 85

两边除以

- 5

c^{2} = 17

对于

x^{2} = f (a)

解为

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

c = 17, c = - 17

作图

流行的例子

u(2u-1)a+(u-1)(2u-1)b+4u(1-u)c=0

u (2 u - 1) a + (u - 1) (2 u - 1) b + 4 u (1 - u) c = 0

0 = x^{2} - 10 x + 16

0 = x^{2} - 10 x + 18

solvefor x,p(x^2+3x+9)=x-x^2

so l v e f or x, p (x^{2} + 3 x + 9) = x - x^{2}

- 5 x^{2} + 7 = 0