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Multiply everything through by e^x   and rearrange so it equals zero
you now have e^2x -e^x-6=0
It is now similar to a quadratic equation, make the dummy substitu...

In order to solve this trickier problem, the quadratic equation must be applied 
x=[-b +- sqrt(b^2-4ac)]/2a

Apologies for messy notation, full solution will be demonstrated during inter...

A parabola shape with x intercepts at x = -3 and x = 7 and the y intercept at y = -21

Factorise to get (x+3)(x-7)=0 
So you can see that x = -3 or x =7 

When seeing this sort of question, I would handle it by explaining what both a receptor and an effector is firstly and giving examples. Secondly, I would explicitly state the difference to make sure the a...