Question

Factorise: x²– 4x – 21 using middle term splitting method​

Answer 1

Answer:

x=7 or x= -3

Step-by-step explanation:

x2-4x-21=0

x2-7x+3x-21=0

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

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

x=7 or x= -3