#when thats not true. multiplication and division are inverse operations. its the same thing. they have the same priority | Explore Tumblr posts and blogs

dilsdoes · 2 years ago

Text

i hate that damn question bc the answer is 9 but the real answer is that its a poorly written question. because 2(1+2) is 2*(1+2) but it also looks like a coefficient in front of a term, and the secret extra rule of pemdas that no one really tells you because it only really applies when theres a variable is that something with a coefficient is one number, so you evaluate it as soon as possible. like if it was 6÷2x where x=3 the answer would be 1 because 2x isnt 2*x its the number that is twice the size of x. but there is no variable. so its not 1.

#dils declares #does this make sense.#anyway that thing makes me so mad because some people answer 1 for this reason #but most people answer 1 because they think multiplication has priority over division (and subsequently addition has it over subtraction)#when thats not true. multiplication and division are inverse operations. its the same thing. they have the same priority #its from left to right.#similarly with addition and subtraction.#anyway this stupid expression ruins my whole fucking night because it reminds me of how lazily math is taught

6 notes · View notes