Question

using the identity. a square -b square = (a+b) (a-b) find the value. 1, 25a square- 49b square.2, z square- 16. 3, (6x+ 7y) (6y-7y). 4,(4-x) ( 4+x).5,(b+7)(b-7). please give answers​

Answer 1

Step-by-step explanation:

1. $(5a) {}^{2} - (7b) { }^{2} = (5a + 7b)(5a - 7b)$
2. $(z) {}^{2} -( 4) {}^{2} = (z + 4)(z - 4)$
3. $(6x) {}^{2} - (7y) {}^{2} = 36x {}^{2} - 49y {}^{2}$
4. $(4) {}^{2} - (x) {}^{2} = 16 - x {}^{2}$
5. $(b) {}^{2} - (7) {}^{2} = b { }^{ 2} - 49$