Which of the binomials below is a factor of this expression?
49x2 + 28xy + 4y2
o a. 7x+2y
b. 7x- 4y
o c. 7x-2y
o d. 7x+ 4y

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