1. The given rectangular equation is 
.
We substitute 
.
Divide through by 
2. The given rectangular equation is:
This is the same as:
We use the relation 
This implies that:
3. The given rectangular equation is:
This is the same as:
We use the relation and 
This implies that:
Divide through by r
4. We have 
We substitute and
This implies that;
5. We have 
We substitute and
This implies that;
Answer:
The answer to your question is: third option, it's a parabola
Step-by-step explanation:
f(x) = (x + 4)²
f(x) = x² + 4
f(x) = (x - 4)² I think this is the right answer, because when get the vertex, the signs are changed, if the -4 is negative, it means that the graph must be located in +4.
f(x) = x² - 4
Therefore, the sentence "A triangle is isosceles if and only if it has two congruent (equal) sides" is <span>biconditionaL</span>
Irrational would be the correct answer
