b) 16a^2 – 9b^2;
b) 16a2 – 9b2;
b) 16a2 – 9b2 = (4a)2 – (3b)2 = (4a + 3b)(4a – 3b);
b) 16a2 – 9b2;
b) 16a2 – 9b2 = (4a)2 – (3b)2 = (4a + 3b)(4a – 3b);