Question
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Tutor-Verified Answer
Answer
x截距为5和-1。
Solution
要求函数
的 x 截距,即令
,得到方程:
使用求根公式:
计算得到:
因此,x 截距为
和
。
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The Deep Dive
To find the x-intercept of the equation
, you set
equal to 0 and solve for
. This gives you the equation
. Factoring the quadratic, you get
. Therefore, the x-intercepts are
and
.
You can also use the quadratic formula,
. Substituting
,
, and
leads to the same solutions, proving that whether you factor or use the formula, you arrive at the same roots! How satisfying is that?