I need help with the first question please.

x^2 - 13x + 36

Step-by-step explanation:

Use the so-called FOIL method:  multiply First terms, Outer terms, Inner terms, Last terms.

First terms:  (x)(x) = x^2

Outer terms:  (x)(-9) = -9x

Inner terms:  (-4)(x) = -4x

Last terms:  (-9)(-4) = 36

Combining the x terms, we get

x^2 - 13x + 36

fist on the left goes with the third on the right. second on the left goes with the fourth on the right. third on the left goes with the second on the right. the fourth on the left goes with first on the right