what is not correct about cross multiplication?

At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.

Get our expert's

answer on brainly

SEE EXPERT ANSWER

Get your free account and access expert answers to this and thousands of other questions.

A community for students.

what is not correct about cross multiplication?

Mathematics
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.

Get this expert

answer on brainly

SEE EXPERT ANSWER

Get your free account and access expert answers to this and thousands of other questions

as opposed to dot multiplication? :P
lollll
okay, we teach or use the phrase cross-multiply without really showing why it works and even tho it appears to violate one of the key rules in maintaining an equation.

Not the answer you are looking for?

Search for more explanations.

Ask your own question

Other answers:

honestly I don't even know what cross multiplication is anymore, could you explain it
same here... HAHA but here's the gist that I have so far gathered.
|dw:1440547770891:dw|
we have this fundamental rule about keeping an equation by performing the same operation we did on one side to the other side
|dw:1440547862839:dw|
it seems trivial at first, but I think this minor thing compounds many problems.
yeah I agree, it's teaching pattern matching for no reason, just like FOIL sucks. It's just distributing. Anyone who can see 2*3=6 should be able to see (1+1)*(1+2)=6 will have to be true too.
yeah, probably why I forgot what cross multiplying is because it's literally a waste of a concept haha
I was thinking about this a while back and then I stumbled on a problem that just reminded me that this needs to be addressed. http://openstudy.com/study#/updates/55dcf68ee4b03aeb8dc1a352
The main issue I would foresee with it is in some cases like for the equation \(\dfrac{1}{x}=\cdots\), cross-multiplying can mislead you into thinking that that \(x=0\) might be a valid solution, which isn't good for obvious reasons.
correct
I suppose there's no issue if you're dealing with concrete rational numbers, and perhaps it's useful as a sort of mnemonic device. You just have to be careful (as anyone doing math should be).
cross multiplication is literally how you define rational numbers usually
a rational number is an element of the quotient of \(\mathbb{Z}^2\) by the equivalence relation \((a,b)\sim(c,d)\Leftrightarrow ad-bc=0\)
so \(\mathbb Q=\mathbb Z/\sim\) and we denote the equivalence class \([(a,b)]\in\mathbb Q\) as \(\frac{a}b\)

Not the answer you are looking for?

Search for more explanations.

Ask your own question