Question 58598
I LEARNED THE SAME WAY, BUT IT WAS P.E.M.D.A.S.
P- PARENTHESIS
E- EXPONENTS
M- MULTIPLICATION
D- DIVISION
A- ADDITION
S- SUBTRACTION
-(10x(exponent 2))+(5xy-9)-(8x(exponent 2)+18xy)=
-10x^2 - 5xy + 9 - 8x^2 - 18xy
-18x^2 - 23xy + 9