Question

6. 9(а + 2b)2 – 4( За - b)2 =​

Answer 1

Answer:

9×2(a+2b) - 4×2(3a-b)

18(a+2b) - 8 (3a-b)

18×a+18×2b - 8×3a - (-4)×b

18a + 36b - 24a +4b

18a -24a +36b +4b

= -6a + 40b