In algebra, 2 times b would be written as 2b.
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In the Pythagorean Theorem b is not twice a. The formula is [ a squared + b squared = c squared].
2xa/b
a + b = 2a - 8 ie - a = - b - 8; a - b = 2b - 4 ie a = 3b - 4 so b + 8 = 3b - 4, ie b = 6 and a = 14 Check: 14 + 6 = 28 - 8 yes; 14 - 6 = 12 - 4 yes!
Call the digits 'A' and 'B', so that the number is written: AB.10A + B = 4 (A+B)10A + B = 4A + 4B6A = 3B2A = B ---> any 2-digit number where the units digit is twice the tens digit12 or 24 or 36 or 48
b = 2a