April 25, 2014

Homework Help: Math 8th Grade

Posted by Lana Von Monroe on Tuesday, April 10, 2012 at 10:43pm.

The chart below shows an expression evaluated for four different
values of x

x: x2+x+5:
1 7
2 11
6 47
7 61

Josiah concluded that for all positive values of x, x2+x+5 produces a prime number. Which value of x serves as a counterexample to prove Josiah’s conclusion false?

A: 5
B: 11
C: 16
D: 21

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