Someone help me on question 7 pls

What is the factored form of the following expressions? d^2 – 13d + 36

What is the explicit formula for this sequence? -7, -4, -1, 2, a.) an = 8 + (b - 1)3 b.) an = -7 + (n - 1)3 c.) an = 3 + (n -1) (-7) d.) an = -7 + (n - )

Hi, can anyone show me how to do this problem? 100 points for this. in advance