Factor the trinomial completely. $x ^ { 2 } - 7 x - 18$
A) $( x + 9 ) ( x + 2 )$
B) $( x - 9 ) ( x + 2 )$
C) $( x - 9 ) ( x - 2 )$
D) $( x + 9 ) ( x - 2 )$
E) not factorable

Question

Quizplus · Accepted Answer

The correct factorization is found by looking for two numbers that multiply to -18 and add to -7. Those numbers are -9 and 2, making the factorization $(x - 9)(x + 2)$.

Factor the Trinomial Completely x2−7x−18x ^ { 2 } - 7 x - 18x2−7x−18

Factor the Trinomial Completely $x ^ { 2 } - 7 x - 18$