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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 

first of all the equation needs to be written in the form (ax+b)(x+c) 

because 2 can only be made by multiplying 2 and 1 we know that a=2 so (2x+b)(x+c)

-6 can be made by multiplying 2 and -...

If P is directly proportional to Q then that means if Q increases P will also increase. If Q decreases P will also decrease. Two values that are directly proportional to each other are related to each oth...