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受欢迎的代数 >

|x^2+6x|=9

解答

x^{2} + 6 x = 9

解答

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

+1

十进制

x = - 7.24264 \dots, x = - 3, x = 1.24264 \dots

求解步骤

x^{2} + 6 x = 9

使用绝对值运算法则: 若

∣ u ∣ = a, a > 0

，则

u = a

or

u = - a

x^{2} + 6 x = - 9 or x^{2} + 6 x = 9

x^{2} + 6 x = - 9 or x^{2} + 6 x = 9

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

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

作图

流行的例子

∣ x - 1 ∣ - 1 = 3

∣ 3 x ∣ = - 12

3 - ∣ x + 2 ∣ = 1

solvefor x,|2x-1|=5

so l v e f or x, ∣ 2 x - 1 ∣ = 5

∣ 9 x - 49 ∣ = - 41