Question

A. (8 - 7x)( 8+ 7x)
B. (9- 8x) (9 + 8x)
C. (9 - 7x)(9 +7x)
D. (8 - 9x)( 8 + 9x)​

Answer 1

Step-by-step explanation:

$({9})^{2} - ({7x})^{2} \\ (9 - 7x)(9 + 7x)$

Answer 2

$\tt {\underline{ \underline{ \red{✠Answer:-}}}}$

Formula used:-

• a²-b²= (a+b)(a-b)

Solution :-

81-49x²

= (9)²-(7x)²

= (9+7x)(9-7x)

Therefore, The answer is option number(C).