Doprowadź wyrażenie do najprostrzej postaci
(2a+3b)-4a(a-2b)+(a+b)(a-9b)
(2a+3b)²-4a(a-2b)+(a+b)(a-9b) = 4a²+12ab+9b²-4a²+8ab+a²-9ab-ab-9b²=a²+10ab
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(2a+3b)²-4a(a-2b)+(a+b)(a-9b) = 4a²+12ab+9b²-4a²+8ab+a²-9ab-ab-9b²=a²+10ab