Question

Factories 49x²-1 using suitable identity

Answer 1

Answer:

Step-by-step explanation:

We have,

$\tt=49x^{2}-1$

$\red{\tt=(7)^{2}\cdot\:x^{2}-1}$

$=\tt(7x)^{2}-(1)^{2}$

$\sf\bullet\:\large{\green{We\:\:know,\:(a)^2-(b)^2=(a-b)(a+b)}}$

So,

$\tt49x^2-1=\green{(7x-1)(7x+1)}$