Answer= (7x - 4)(x - 3)
Work=
You’re looking for 2 numbers that add to -4 and multiply to -21.
-7 + 3 = -4
-7 x 3 = -21
So it’s (x - 4)(x - 21)
Divide both by 7, because it is attracted to the x squared.
Remember: if a number is not divisible by 7, the 7 attaches to the x
Answer= (7x - 4)(x - 3)