Given:

Required:
We need to factorize the given expression.
Step-by-step explanation:




The given expression is a difference of perfect sqaure because 1 is the perfect sqaure and 49 is also the perfect square of 7.
We know that a multiple of a perfect sqaure is also a perfect square.

We get

Use the structure of the difference of perfect squares to factorize the given expression.

Substitute a =1 and b =7a in the formula.


The number of factors = 2
Final answer:
The given expression is a difference of perfect sqaure because 1 is the perfect sqaure and 49 is also the perfect square of 7.
We know that a multiple of a perfect sqaure is also a perfect square.

The number of factors = 2