Question

plz help question 9 all parts

Answer 1

(b) m^2+3n+mn+3m
=m^2+mn+3n+3m
we should take common in this
m(m+n)+3(m+n) (we can write (n+m) or (m+n) )
(m+3)(m+n)

(c) 16(21+3m)^2-12(3m-21)
16(21+3m)+12(21-3m) {to change the sign of this we should change the sign of 12}
(21-3m)^2(16+12)

(d) lm+mn+nl+n^2
m(l+n)+n(l+n)
(l+n)(m+n)

(e) xy+bcxy-z-bcz
xy(1+bc)-z(1+bc)
(1+bc)-(xy-z)

(f) abc+2a^2b^2c^2 +1+2abc
abc(1+2abc)+1(1+2abc)
(1+2abc) (abc+1)