Answer: 9
Step-by-step explanation:
Given
The function is 
To make it a perfect square, compare it with 
Here,

So, c must be square of b i.e. 9

Therefore, value of c is 9.
Answer:
7
Step-by-step explanation:
7²/x²-2 when x=3
49/3²-2
49/9-2
49/7
answer=7
Step-by-step explanation:
7x + 8y = -12
8y=-12-7x
y=
