Question

Write down the value of the following by inspection: (y+5) (y-4)​

Answer 1

Answer:

(y+5((y_4)

multiply to each other

y^2+y_20

Answer 2

Answer:

let,(y+5)(y-4)=0

y²-4y+5y-20=0

y²+y=20

y(y+1)=20

y=20;y+1=20

/////// ;y=20-1

;y=19

hence,y=20 and y=19