Question

factories x^2-4x-21​

Answer 1

Step-by-step explanation:

follow me and marks as brainlist

Answer 2

Step-by-step explanation:

x^2 - 4x - 21

x^2 - 7x + 3x - 21

x ( x - 7 ) 3 ( x - 7 )

( x - 7 ) ( x + 3 )

therefore ,

x - 7 = 0 OR. x + 3 = 0

x = 7. |. x = -3

SO,

X = 7 or -3

Thank you , ☺️

MARK AS BRAINLIEST.