X² - 5x + 6 = 0 (R: 2, 3)

Are you suppose to factor? If so start by finding the factors of 6 which are 1,6.

6-1 will equal the middle number 5.

(X-1) (x+6)

Then set them both up to 0

X-1=0 add 1 to both sides x=1

X+6=0 subtract 6 to both sides x=-6