Question

pls answer this question​

Answer 1

Answer:

factorise all three by cubic method

Answer 2

Answer:

5. (5a+b+4c)(25a^2+b^2+16c^2-5ab-4bc-5ac)

7. (1+b+2c)(1+b^2+4c^2-b-2bc-2c)

9. (3a-b+2c)(9c^2+b^2+4c^2+3ab+2bc-6ac)

hope it will help you