Find, in the form y=ax2+bx+c, the equation of the quadratic whose graph:
a. cuts the x-axis at 5 and 1, and passes through $(2, -9)
b. cuts the x-axis at 2 and −21, and passes through $(3, -14)
c. touches the x-axis at 3 and passes through $(-2, -25)
d. touches the x-axis at −2 and passes through $(-1, 4)
e. cuts the x-axis at 3, passes through (5,12), and has axis of symmetry $x = 2
f. cuts the x-axis at 5, passes through (2,5), and has axis of symmetry x=1.