Question

Factorise a^2-23a+112

Answer 1

a^2 -23a+112
=a^2- 16a-7a+112
=a(a-16)-7(a-16)
=(a-7)(a-16)
 a=7 or a=16

Answer 2

a^2-23a+112
=a^2-16a-7a+112
=a(a-16)-7(a-16)
therefore (a-16)(a-7) is factor of a^2-23a+112