Question

Maths
In 14. Factorisation
I. Choose the correct answer
1. The factors of 25a2 - 49b2 are
[a] (5a - 7b) and (7a + 5b) [b] (5a - 7b) and (7a - 5b)
[C] (5a + 7b) and (5a - 7b) [d] (7a - 5b) and (5a + 7b)
2. 9(a + 2b)2 - 4(3a - b)2 =
[a] (9a + 4b)(6b - 3a)
[b] (9a + 4b)(8b - 3a)
[c] (9a + 4b)(9b - 3a)
[d] (9a - 4b)(8b - 2a)
3. (12x4 + 16x3 - 28x2 + 24x) + 4x is.
al 3x3 + 4x2 - 7x - 6
(cl 3x3 - 4x2 - 7x - 6
[b] 3x3 + 4x2 - 7x + 6
[d] 3x4 + 4x2 - 7x + 6​

Answer 1

Answer:

1. The factors of 25a2 - 49b2 are

[a] (5a - 7b) and (7a + 5b)