Answer:
n²-7n-21
Explanation:
Given the expression:

First, open the brackets:

Next, bring the like terms together and simplify:

Answer:
A & C
Step-by-step explanation:
Please just trust me
Answer:
it is scalene type of triangle because no sides are equal
Answer:
B. {1, -4}
Step-by-step explanation:
Just rotate the screen and look at the position.