15z^2+45z and 5z^2+40z+75 find Lcm

Answer 1

15z^2+45z
=15z(z+3)

5z^2+40z+75
= 5(z^2 + 8z +15)
= 5(z+5)(z+3)

LCM = 15z(z+3)(z+5)