Question

factorise the following
pls help me​

Answer 1

Step-by-step explanation:

25(a+b)²-16(a-b)²

=[5(a+b)]² - [4(a-b)]²

=(5a+5b+4a-4b)(5a+5b-4a+4b)             [a²-b²=(a+b)(a-b)]

=(9a+b)(a+9b)

Answer 2

SOLUTION

$= > 25(a + b) {}^{2} - 16(a - b) {}^{2} \\ = > {5}^{2} (a + b) {}^{2} - {4}^{2} (a - b) {}^{2} \\ = > (5(a + b)) {}^{2} - (4(a - b) {}^{2} \\ = > (5a + 5b) {}^{2} - (4a - 4b) {}^{2} \\ = > (5a + 5b) + (4a - 4b)(5a + 5b) - (4a - 4b) \\ = > (5a + 5b + 4a - 4b)(5a + 5b - 4a + 4b) \\ = > (9a + b) \: \: (a + 9b)$

hope it helps ☺️