Question

x2- 10x + 21 che avayav liha​

Answer 1

Step-by-step explanation:

x2-10x+21=

=x2-(7+3)x+21

=x2-7x-3x+21

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

=(x-7)(x-3)

hence either x=7 or x=3