Question

Which trinomial cannot be factored using integers?
A) x^2-2x-63
B) x^2+16x+63
C) x^2-3x-3
D) x^2+5x-104

Answer 1

Any ideas?
:-)

Answer 2

do you know the term under the root in the quadratic formula

b^2-4*a*c

Answer 3

y = a*x^2 + b*x + c

\[x = \frac{ -b \pm \sqrt{b^2-4*a*c} }{ 2*a }\]

calculate the root b^2 - 4 * a * c term
calculate that for each one, see if you spot anything

Answer 4

or calculate the whole thing and see which values of x are not integers (whole numbers including the negatives)