Question

For how many positive integer values of x is the sum x^2+4x+4 less than 20?

Answer 1

2 times

Explanation:

Note that since we can only use positive integers for , the minimum will be x = 1. Testing x = 2, we get . Since , we know that only will work, thus, there are positive integer values of such that this function is less than 20.

Answer 2

1^2 is 1+4 times 1 is 5 plus 4 is 9
2^2 is 4+4 times 2 is 12 plus 4 is 16
3^2 is 9+ 4 times 3 is 21 XXXXXXX==> 2 times