Question

xsquare - 10x+21

No nonsense answer otherwise will be reported

Answer 1

simply, By splitting middle term we can solve it.

now ,

X square-7x - 3x + 21

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

( x-3) (x-7)

x-3= 0 and x -7 = 0

x = 3 and x = 7