Question

y^2-4y-21 factorise by splitting middle term

Answer 1

Answer:

y =7 or y=-3

Step-by-step explanation:

y^2-7y+3y-21=0

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

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

y-7=0 or y+3=0

y=7 or y=-3