What is x squared 6x - 7 factorised?

Identify a1 and r for the geometric sequence an= -256(-1/4) n-1

Lola says these two expressions have the same value. expression a expression b which explains whether lola is correct?

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