Question

factor the trinomial y^2 -10y+21

Answer 1

no not everythin, the constants are negative, my bad.

Answer 2

(y -7) (y-3)

see?

Answer 3

@esmig10, do you understand

Answer 4

factors of 21

21 & 1
7 & 3
(you can put some or all negative or positive.)

what combination of those factors add up to -10, and make 21 when you multiply them together?