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did you say 6-(-9)=15 then it is true as negative multiplied by negative is always positive. Also multiplication comes first than addition. Hey, here is a FREE tip. Do you need to memorize the order of priority of these function then learn B O D M A S (Bracket of Division Multiplication Addition Subtraction).
In general no. He/she will need some elementary vector calculus as well if he will try solve problems regarding design of various circuits powered by AC. Some elementary integral/differential calculus will be useful if he/she wants to solve more complicated problems with respect to power/energy consumption for example.Let just say Algebra is a MUST!
Just follow the order of operations. 1. Parenthesis 2. Exponents 3. Multiply and Divide in order from left to right, and 4. Add and subtract in order from left to right. I'm assuming you are missing the left parenthesis before the 6 (.