Expand (2a-3b)3.
(2a-3b)3Using the formula (x–y)3=x3–y3–3xy(x–y),(2a–3b)3=(2a)3–(3b)3–3(2a)(3b)(2a–3b)=8a3–27b3–18ab(2a–3b)Or=8a3–27b3–36a2b+54ab2.
Subtract:
(1) 5y from 4x
(2) −2a from 3b
(3) 5p from −12p
(4) −4c from −7d
(5) 5pq from 7mn