Question

Factorise9z^3+27z^2-100z+300 if3z+10is a factor

Answer 1

3z+10=0

3z= -10

z= -10/3

given: 9(-10/3)^3 + 27(-10/3)^2 - 100(-10/3) + 300 = 0

= -1000/3 + -300 + 1000/3 + 300

= 0