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b.4ab+2a²+16b²
b) 4b²+4ab+a²+2(a²-4ab+4b²)-a²-4b²+4ab = 4b²+4ab+a²+2a²-8ab+8b² = 3a²+12b²-4ab
Myślę ze powinno być dobrze.
b) =(2b + a)(2b +a)+2[(a-2b)(a-2b)]-(a²-2ab+2ab+a²)+4ab=4b² +2ab +2ab +a² +2(a² - 2ab -2ab +4b²) - a² +2ab - 2ab -a² +4ab= 4b² +4ab +a²+2a²-4ab +8b² - 2a² + 4ab=4b²+a²