Question

factorise the following by using the identities or regrouping.
a. 12x^3y^2+24x^2y^2
b. 36x^3y^2z^2+48x^2y^3z
c. 3x^2+39x+108
d. x^3+7x^2-78
e. x^4+22x^3+121x^2

Answer 1

a. 12x^3y^2+24x^2y^2

=>12x^2y^2(x+2)

b. 36x^3y^2z^2+48x^2y^3z

=>12x^2y^2z(3xz+4y)

c. 3x^2+39x+108

=>3(x^2+13x+36)

d. x^3+7x^2-78

=>the question is wrong

e. x^4+22x^3+121x^2

=>x(x^3+22x^2+121x)