Answer:
Final answer is .
Step-by-step explanation:
Given expression is .
Now we need to find about what value for c will make the given expression , a perfect square trinominal.
Coefficient of middle term that contains x, in -7.
Take half of that so we get .
Then take square of the half value.
We get .
We add the square value to make perfect square trinomial.
Hence final answer is .