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x²+18x+45=60怎么算

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问题更新日期:2024-10-15 14:20:14

问题描述

x²+18x+45=60怎么算,在线求解答
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最佳答案

要解决这个方程 x²+18x+45=60,我们需要将它转换为标准二次方程的形式,即将等式右侧的60移到左侧,使得等式为0。

x² + 18x + 45 - 60 = 0

合并和简化项:

x² + 18x - 15 = 0

现在,我们可以尝试使用因式分解、配方法或求根公式等方法来解决这个方程。使用求根公式是一种常见的解法。

对于一般形式的二次方程 ax² + bx + c = 0,其根可以通过以下公式计算:

x = (-b ± √(b² - 4ac)) / (2a)

将 a=1,b=18,c=-15代入公式,我们可以计算出 x 的值:

x = (-18 ± √(18² - 41(-15))) / (2*1)

简化计算:

x = (-18 ± √(324 + 60)) / 2

x = (-18 ± √384) / 2

现在,我们可以进一步计算两个根:

x₁ = (-18 + √384) / 2

x₂ = (-18 - √384) / 2

这样,我们就得到了方程的两个解,即 x₁ 和 x₂ 的值。

请注意,由于方程为二次方程,可能存在实数解、复数解或重根(重复的解)。具体的解取决于方程的判别式。在这种情况下,您可以计算解并进行进一步的简化和近似,如果需要的话

其他回答

先移项让方程右边为零

x方+18x+45-60=0,x方+18x-15=0,

用配方法,(x+9)方-96=0,

(x+9)方-根号96=0,利用平方差公式分解因式得(x+9+根号96)(x+9-根号96)=0,解得x=-9-4根号6,另一个解是x=4根号6-9

其他回答

To solve the equation x² + 18x + 45 = 60, you need to rearrange the equation and find the values of x that satisfy the equation. Here's the step-by-step solution:1. Move the constant term (60) to the other side of the equation by subtracting 60 from both sides: x² + 18x + 45 - 60 = 02. Simplify the equation: x² + 18x - 15 = 03. To factorize the quadratic equation, you need to find two numbers that multiply to give -15 and add up to 18. The numbers -3 and 5 satisfy this condition, since (-3) * 5 = -15 and (-3) + 5 = 2: x² + 5x - 3x - 15 = 04. Group the terms and factorize by taking out the common factors: x(x + 5) - 3(x + 5) = 05. Simplify the equation: (x - 3)(x + 5) = 06. Apply the Zero Product Property, which states that if the product of two factors is equal to zero, then at least one of the factors must be zero: x - 3 = 0 or x + 5 = 07. Solve each equation separately: For x - 3 = 0, add 3 to both sides to isolate x: x = 3 For x + 5 = 0, subtract 5 from both sides: x = -5Therefore, the solutions of the equation x² + 18x + 45 = 60 are x = 3 and x = -5.

其他回答

x²+18x-15=0x²+18x+81-96=0

(x+9)²=96 (x+9)=4√6,(x+9)=-4√6

x=4√6-9或x=-4√6-9

其他回答

十字相乘法,等同于x²+18x-15=0

即(x-3)(x-5)=0解得x=3或者x=5