
math question
Meow? Math question. Which is the correct way of doing this?
Say i have a math problem of AB2 <ab squared> converting it to c.
1 Do you multiply a times b then square
2 Do you square b then multiply by a
example a = 3 b =7
if you do it by number 1 you have 3*7 = 21 then square = 441
if you do it by number 2 you have 7 squared = 49 then times 3 = 147
which is the correct answer? Meow?
i have one book that says one way and another that says the other way?

BEDMAS
Brackets, exponents, division, multiplication, addition, subtraction
so, 2.

please someone correct me if i'm wrong, but i think you do it this way.
value of (a) multiplied by the value (b) squared
ab^2 = a * b^2 = 3 * 7^2 = 3 * 49 = 147
someVariable = a * sqrt(b);
otherwise you would need to do the following.
(ab)^2 = (a)^2 * (b)^2 = 3^2 * 7^2 = 9 * 49 = 441
notice how the brackets change everything

good news.... eighter one give you an answer
bad news .... only a 50% chance of getting a correct answer
so if e = mv2 energy equals velosity squared
you square v then multiply by mass of 3grams? to get the energy correct answer. of 147 g/ftsec
ok thank you

If there are no parenthesis, like in e = mv^2, it means the same as e=m*(v^2), i.e. square v first, then multiply.

Assuming you are talking about kinetic energy, the equation is 1/2 mv^2, and you need to use consistent units, or the answer will be meaningless.

thank you anonytmouse i forgot what the exact formula was and what units were used. i could not figure out if one of the books was wrong or if i had messed up. book wrong. besides the energy formula there are other things that use the d =ab^2 type math statement. so i thought i had better check to make sure i was doing things correctly. thank you all again.