Question

Jared predicted that the number of mango trees, x, planted in a farm could yield y = (x + 40)² + 60 mangoes per year. What is the minimum value of trees planted per year?

a. 60
b. 70
c. 80
d. 90​

Answer 1

60

Explanation:

The quadratic function tells me that the graph has a vertice at (-40, 60).

So the minimum number of mango yield per year is 60.

Howevery, i believe that there is a mistake in the question;

The quadratic function should be
`y = (x-40)^2 +60`

Because we cannot have negative number of mango tree.