Book Maths Puzzle Algebra

x=120+-_/(-120)^2-4(9)(-81)
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2(9)

a=9
b=-120
c=-81

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Book Other Question

farmer James had 225 animals in his farm 20% of the animals were Cows and the rest were sheep
How many Sheep were they?
How many cows were on his farm.
Normally they are 2000 ch Solve
5x-6>14