Question

9(a-2)^2-16a(a+2)^2...
factorise it...

Answer 1

/:bf /: answer

$9(a - 2) {}^{2} - 16(a + 2) {}^{2} \\ = > \: \: 9a {}^{2} - 36a + 36 - (16 {a}^{2} + 64a + 64) \\ = > \: \: - 7 {a}^{2} - 100a - 28 \\ = > \: \: - (7 {a}^{2} + 98a + 2a + 28) \\ = > \: \: - (7a + 2)(a + 14)$

hope this answer will help you.