Answer:
y^2-23y+42
Step-by-step explanation:
y^2-(21+2)y+42
= y^2-21y-2y+42
= y(y-21)-2(y-21)
= (y-21) (y-2)
= y=21 or y= 2
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Answer:
y^2-23y+42
Step-by-step explanation:
y^2-(21+2)y+42
= y^2-21y-2y+42
= y(y-21)-2(y-21)
= (y-21) (y-2)
= y=21 or y= 2