4 ms·
That’s a neat one! (a + b)(a - b) = a^2 - b^2 a^2 = (a + b)(a - b) + b^2 So pick a value of b that makes a - b end in a zero.
by koolba 2y ago
That’s a neat one!
(a + b)(a - b) = a^2 - b^2
a^2 = (a + b)(a - b) + b^2
So pick a value of b that makes a - b end in a zero.
- frankus 2y agoFWIW you can also pick a value of b to make a + b end in a zero, which keeps b at 5 or less.