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
Answer:
The answer is 2
Step-by-step explanation:
Multiply the numerator and denominator by the conjugate.
There can only be two outcomes that result from the coon being flipped because there’s only two sides.