book Maths Puzzle Numerical Ability

Solve using the quadratic equation:
x^2 - 3x - 23 = 5

3x^2 - 2x = 15x - 10

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book Other Question

Determine the point A(x,y) so that the points A(x,y), B(0,3) C(1,0), D(7,2) will be the vertices of a parallelogram.

I think it is A(5,6), but I am not sure. Thank you for your help.
Use FOIL to multiply:
(5x - 8)(x - 7)


ANY HELP :)