Question

**MEDAL!!**

Answer 1

Select all the expressions that cannot be factored using integral coefficients and integral constants.
A. 25x^2 - 40x + 16
B. 2x^2 + x + 4
C. 6x^2 - 2x - 20
D. x^2 - 2x - 4

Answer 2

come on just put them all to Wolfram|Alpha and see if he provides an alternative (factorized) way of expressing them.