I am assuming you wrote the problem wrong. Is it a^2?
A^2 -4A-21=0
(A-7)(A+3)=0
A=7 A=-3, ignore the negative number because it doesn't make sense if you plug in for a.
length=a+3=7+3=10
Width=7=a
Im pretty sure it can. 20 +20 = 40. if that helps...
Answer:
Step-by-step explanation:
-2, 1, 2, 4
Ok so in order to find the answer to this problem we are going to Multiply
and
.
answer = 2
You can just use a calculator unless you need to show your work
