Factor the trinomial x squared minus 4 x minus 21x24x21 Sele

Factor the trinomial. x squared minus 4 x minus 21x24x21 Select the correct choice below and, if necessary, fill in the answer box to complete your choice. A. x squared minus 4 x minus 21x24x21equals=nothingm B. x squared minus 4 x minus 21x24x21 is prime.

Solution

x squared minus 4 x minus 21x24x21

x^2 -4x - (21x^2 -4x -21)

= x^2 -4x-21x^2 +4x +21

= 19x^2 +21

Its is a prime ; Option B