Find the LCM.
-$x ^ { 2 } - 9 x + 20 , x ^ { 2 } - 3 x - 4$
A) $( x - 4 ) ( x + 1 )$
B) $( x - 5 ) ( x - 4 )$
C) $( x - 5 ) ( x - 4 ) ( x + 1 )$
D) $( x + 5 ) ( x + 4 ) ( x + 1 )$

Question

Quizplus · Accepted Answer

The LCM of two polynomials is the product of their factors, excluding any duplicates. Factoring each polynomial: $x^2 - 9x + 20 = (x - 5)(x - 4)$ and $x^2 - 3x - 4 = (x - 4)(x + 1)$. The LCM is $(x - 5)(x - 4)(x + 1)$.

Find the LCM x2−9x+20,x2−3x−4x ^ { 2 } - 9 x + 20 , x ^ { 2 } - 3 x - 4x2−9x+20,x2−3x−4

Find the LCM $x ^ { 2 } - 9 x + 20 , x ^ { 2 } - 3 x - 4$