# Fill up the gap #49x^2-square+25# to make it a perfect square?

##### 1 Answer

Jan 26, 2017

Answer is

#### Explanation:

Let us recall the formula

Here, we have **first term** as square of **third term** is also square of another term

and **middle term** is

In **first term** is

we also have **third term** as

Hence, **middle term** ought to be **?** by

i.e.