Question

x square minus 21x plus 108. factorise

Answer 1

hey dear,

here is your answer..

x^2-21x+108=x^2-12x-9x+108

=x(x-12)-9(x-12)

= (x-9)(x-12)

so its factors are 9 and 12

hope it helps you

thanks for giving me opportunity to help you ...

:) :)