3 ms·
You don’t have to do all that. If you have a+b and a-b you’ll get 2a when added together. So knowing just the sum we can say that a is 9 in this setup. Now w
by IanCal 11mo ago
You don’t have to do all that.
If you have a+b and a-b you’ll get 2a when added together.
So knowing just the sum we can say that a is 9 in this setup.
Now we need to figure out b.
Multiplying out those you get
a^2 + ab -ab - b^2
And I get a longing for not having started this a phone.
Cancels and fill in what we know and we get 81 - b^2 = 37
b = sqrt(44) = sqrt(4)*sqrt(11) = 2sqrt(11)
- lupire 11mo agoNone of this is required for solving the problem in your head. All that is required is the ability to add 1-digit unit fractions in your head, as the problem requests.