r^² ＋ ５r － ４０ ＝ ８ ＋ ３r
Understand the Problem
这个问题要求我们解一个包含r的二次方程。我们需要将方程整理成标准形式，然后使用适当的方法找出r的值。
Answer
r = 6 and r = -8
The solutions are r = 6 and r = -8.
Answer for screen readers
The solutions are r = 6 and r = -8.
More Information
This quadratic equation can be solved by factoring. The solutions are obtained where the factored terms equal zero.
Tips
A common mistake is not simplifying properly before factoring. Always combine like terms and set the equation to zero before attempting to factor.
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