Question

Factors of y² + 10 y + 21 are ______
(a) (y + 3) and (y - 7)
(b) (y - 3) and (y + 7)
(c) (y - 3) and (y - 7)
(d) (y + 3) and (y + 7)

Answer 1

y^2+10y+21=y^2+7y+3y+21=0 then (y+3)(y+7)

Answer 2

Sol......................