Which polynomial represents the algebra tile configuration shown?

x2 + 3x + 4
x2 + 3x − 4x
−x2 − 7
−x2 + 3x − 4

Which sum or difference identity would you use to verify that cos (180° - q) = -cos q? a.) sin (a -b) = sin a cos b – cos a sin b b.) cos (a -b) = cos a cos b – sin a sin b c.) cos (a -b) = cos a cosb + sin a sin b d.) sin (a + b) = sin a cos b + cos a sin b