Question

factorise 81 a2b2c2+ 64a6b2-144a4b2c

Answer 1

81 a^2 b^2 c^2 + 64a^6 b^2 - 144a^4 b^2 c

= a^2 b^2 (81c^2 + 64a^4 - 144a^2 c)

= a^2 b^2 (8a^2 + 9c)^2

hence the answer is

a^2 b^2 (8a^2 + 9c)^2