Using quadratic formula you can have a maximum of two solutions. When you set this problem equal to zero, your a=-1, b=-10, c=2
So you would add 12 to the other side of the equation, and 9+12=21, so x=21.
Divide both sides by -5
You would then get (square root)x=3 since the negatives would cancel out
Then you square both sides
You will be left with (x)*2=(3)*2
Your answer will be C. X=9
Hope that helped!
X+y=18
5x+y=62
x is number of five dollar bills and y is one dollar bills.
