Question

factorize the quadratic polynomial by splitting the middle term y square -4y-21

Answer 1

Answer:

(y + 3) (y - 7)

Step-by-step explanation:

y^2 -4y -21

y^2 -7y +3y -21

y (y -7) +3 (y -7)

(y + 3) (y - 7)

Answer 2

Step-by-step explanation:

y2-4y-21

y2-7y+3y-21

y(y-7+3(y-7)

for zeroes

(y+3)(y-7)=0

=>y+3=0

y=-3

y-7=0 y=7