What is the vertex of the quadratic function f(x) = (x - 1)(x + 2)?

care to share were the trapezoid shown is ?

for this case we must apply distributive property to the following expression:

the distributive property states that:

then, when applying the property we have to multiply the -2 for each term within the parenthesis:

df =

both have same length

is the anwser b. (-13)?