Question: hi there i can do q2 if i draw...

Hi there - i can do q2 if I draw the graphs and see where they intersect but would love to see your working for both q2 and q3 - with q3 i got super close I think... thanks heaps

I ended up with  $k<\pm 2\sqrt{3} +8but i don\text{'}t think that quite works for the answer which is \left(b\right)$