Question

S(-1)=x2-4x-21what is the answer?

Answer 1

Answer:

3 and 7

Step-by-step explanation:

x

2

−4x−21=0

x

2

−7x+3x−21=0

x(x−7)−3(x−7)=0

(x−7)(x−3)=0

x=3,7