What is the factored form of this expression? 9x^2-64y^2

The general form of the quetion of a circle is ax^2+by^2+cx+dy+e=0 where a=b=0 if the circle has a radius of three units and the center lies on the y axis which set of values of a, b, c, d, and e might correspond to the circle

Lines a and b are parallel. what is the value of x? -5 -10 -35 -55

Rewrite the following quadratic functions in intercept or factored form. show your work. y = x^2 + 7x + 10