(4,4).........................
Mistake in Line 2 : Was in the determining the values for a ,b,c
Mistake in Line 4 : Not taking the square roots of both sides.
Step-by-step explanation:

First Mistake : Line 2

Second Mistake : Line 4

Correct Solution :


Mmm looks like a test. I don't know if we should be answering this.
Answer:
2
16yx + 8yx - 8y
Step-by-step explanation: