Hi there

for you need to find graphically where cuts the x-axis. It seems to cut through the points

With the next question you have to consider where and intersect each other.

They do not intersectat a value that is clearly defined on your graph but you can conclude that the solution lies on

To get exact values in can solve this kind of equations using a little algebra, solve for x

moving everything to one side

then completing the square

Completing the square - Wikipedia, the free encyclopedia