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

Answer:

Step-by-step explanation:

1.

$25a^{2} - 49b^{2}\\(5a)^{2} - (7b)^{2}\\(5a+7b)(5a-7b)$

2.

$z^{2} - 16\\z^{2} - 4^{2}\\(z+4)(z-4)$

3.

(6x+7y)(6x-7y)

$(6x)^{2} - (7y)^{2} \\36x^{2} - 49y^{2}$

4.

(4-x)(4+x)

$(4)^{2} - x^{2} \\16 - x^{2}$

5.

(b+7)(b-7)

$b^{2} - 7^{2} \\b^{2} - 49$

Hope it helps