Question

2xsquare-x-21 factorise​

Answer 1

Answer:

2xsq-x-21

answer is 7/2 is its root

-3 is also its root

Answer 2

Step-by-step explanation:

2x^2 - x - 21=0

2x^2 - x - 21=02x^2+6x-7x-21=0 {L.C.M of (21×2)}

2x^2 - x - 21=02x^2+6x-7x-21=0 {L.C.M of (21×2)}=2x(x+3)-7(x+3)=0

2x^2 - x - 21=02x^2+6x-7x-21=0 {L.C.M of (21×2)}=2x(x+3)-7(x+3)=0=(2x-7)(x+3){ANS}