Answer:
It isn't necessary but having a positive coefficient for 
makes things like completing the square and factoring easier.
Step-by-step explanation:
Answer:
the original area is 64ft squared or 169ft squared more perdurable 64
Step-by-step explanation:
(x-2)(x+7)=90
x^2 +5x -14=90
x^2 +5x -14 -90=90-90
x^2 +5x -104=0
factor it out
(x−8)(x+13)=0
so 8 or -13
N = 15
First you would add 5 to both sides.
Then you would Multiply 3 on both sides to get N by itself
By multiplying 3 x 5 it gives you 15
So N = 15
