7) 6x + 16 + = 2x + 28 8) 12x + 12 = 3x + 84
9) 3+ 6x = 2x + 27
10) 8x + 2 = 72 + x
11) 2x + 20 = x + 60
12) 4x + 1 = 25 + 2x

Ok i'm still not learning this so don't judge.

Step-by-step explanation:

other things to help from paper

which may not help what i did on paper at school.

         Hope this helps  ;)

if the eqn of the parabola is f(x) = (x-4)(x+2), we need to mult. this out to find the coordinates of the vertex.

then f(x) = x^2 + 2x - 4x - 8, and f(x) = x^2 - 2x - 8.

one way in which you can find the vertex is to calculate x = -b / (2a).   here, that comes to

        )

x = = 1.   f(1) = 1^2 - 2(1) - 8 = - 9.   vertex is at (1, -9).

        2(1) 

find another point on the curve:   let x=0, for which y=-8.   then (0, -8) is on the curve.   plot the vertex and this point and draw a smooth parabola thru both.

hope this