Factor using the identity: a3 + b3 = (a + b)(a2 – ab + b2) z3 + 8 (z + 2)(z2 – 2z + 4)? (z + 2)3? (z3 + 8)(z2 – 8z3 + 64)? (z + 8)(z2 – 8z + 64)?

Martha is training for a duathlon, which includes biking and running. she knows that yesterday she covered a total distance of over 55.5 miles in more than than 4.5 hours of training. martha runs at a speed of 6 mph and bikes at a rate of 15.5 mph.