do you mean pemdas?
parenthesis, exponents, multiplication/division, addition/subtraction
that is the order in solving an equation
example: (#^2 means squared)
(x+9)^2 + 2(x + 2) = 1
(x+9)(x+9) + 2(x+2) = 1
foil
x^2 + 18x + 81 + 2x + 4 = 1
x^2 + 20x + 85 = 1
subtract 1
x^2 + 20x + 84
then you would finish it. it’s a bad example. but that’s how you do it.
