Question

find the zeros of the following quadratic polynomials by factorisation method :

Answer 1

divided by 3
21y^2-11y-2=0

;21y^2-14y+3y-2=0

;7y(3y-2)+1(3y-2)=0

;(3y-2)(7y+1)=0

;y=2/3,-1/7

is your answer