Question

(iii) (4a - 7b)(4a + 7b) ​

Answer 1

Answer:

(4a-7b)²

Step-by-step explanation:

using formula

(a-b)²=(a-b)(a+b)

Answer 2

Answer:

$16a^{2} - 49 b^{2}$

Step-by-step explanation:

(4a-7b)(4a+7b)

= $16a^{2}$-28ab+28ab -$49b^{2}$

= $16a^{2} - 49 b^{2}$