The number in the photo should be the answer but the problem might just be that your question was worded incorrectly.
1. Use Difference of squares: a^2-b^2=(a+b)(a-b)
(x+k)(x-k)=0
2. Solve for x and k
x=+-k
k=+-x
Answer:
The lines are perpendicular, meaning if they were to intersect, they would form four right angles.
I am not sure but I would say either step 2 or 4 but I am not 100% sure I hope you do well. Good Luck:)