Answer :
foil stands for first,outer,inner,last
3x * 3x = [tex]9 x^{2} [/tex]
3x*-5= -15x
-7*3x= -21x
-7*-5= -35
then you add like terms
[tex]9 x^{2} -36x-35[/tex]
the answer is choice c
3x * 3x = [tex]9 x^{2} [/tex]
3x*-5= -15x
-7*3x= -21x
-7*-5= -35
then you add like terms
[tex]9 x^{2} -36x-35[/tex]
the answer is choice c