It is 10 if a = 4 and c = 3
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To open the door, you have to turn all the squares grey by landing on it with the knight chess piece. If you land on a grey box, it'll turn back to it's original color.Columns (A to D, left to right) Rows (1-4, top to bottom)C2 A3 C4 D2 B1 C3 D1 B2 D3 B2 A2 C1 B3 D4 B3 A1 B3 C1 A2 C3 A4 C3 A2 C1See related link below for screenshots.
C3
a3 + b3 + c3 + 2(a2)b + 2(b2)c + 2(a2)c + 2ab2 + 2(c2)b +abc
Press "AC" then press and hold "RATE SET" the display turns off for about 2 seconds and then "EURO RATE" appears at top of screen, release "RATE SET" and type the value of your currency and press "RATE SET" again to confirm. Note: On newest versions "RATE SET" is on the "%" key, on models with support for more currencies the keys can be "C1","C2","C3" and so, but the procedure is the same, repeat it with each key for each currency
Your notation is confusing. It looks like: 8a3 + 4a2b - 2ab2 - b3. So if you look at it, notice 23 = 8 & 22 = 4, so take c = (2*a), and you have c3 + c2b - cb2 - b3, Now note that if c = b, the polynomial is zero, so (c-b) or (b-c) is a factor. So divide by (c-b) using long division: (c - b)(c2 + 2cb + b2) {the second polynomial is a perfect square: (c+b)2}, so (c-b)(c+b)2, then substitute c = 2a, and get (2a-b)(2a+b)2 finally, multiply it out to make sure you get the original polynomial.