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b)
y=1*(x-4)(x+9)=x^2+9x-4x-36=x^2+5x-36
b=5
c=-36
c)
y=1*(x-1/3)(x-7)=x^2-7x-1/3x+7/3=
=x^2-7 1/3x+ 2 1/3
b=-7 1/3
c=2 1/3
d)
y=1*(x-2/7)(x+3/5)=x^2+3/5x-2/7x-6/35=
=x^2+21/35x-10/35x-6/35=
=x^2+11/35x-6/35
b=11/35
c=-6/35