21.7 is a good BMI for adults, and should differ no more than x. Write an equation to find the highest and lowest BMI for a healthy adult. Then solve if x=32.

Question

Here's the whole question: Body Mass Index (BMI) is used by doctors to determine weight categories that may lead to health problems. According to the Centers for Disease Control and Prevention, 21.7 is a healthy BMI for adults. If the BMI differs from the desired 21.7 by more than x, there may be health risk involved. Write an equation that can be used to find the highest and lowest BMI for a healthy adult. Then solve if x=32.

Answer 1

If I've interpreted this question correctly...

 

If the BMI should not vary by more than x, then the most it can be is 21.7+x and the least it can be is 21.7-x.

 

So if x is 32, the most the BMI can be is 21.7+31 or 53.7. The least it can be is 21.7-31, or -10.3.