Math 8th Grade

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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

  • Math 8th Grade -

    Try each one see which one isn't prime. You won't have to go far down the list.

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