Right triangle because a2<span> + b</span>2<span> = c</span><span>2</span>
Answer:

Step-by-step explanation:

Answer:
4,
Step-by-step explanation:
graph is a sad face, therefore a is negative. so 1 and 3 are out. the c is the y intercept, and the y intercept is at tye positve side. so 4 is the correct one.
Without a vale to substitute for the variable, we can only simplify the expression: since
and
, the expression becomes

Now use the property 

Now we can factor
:
