(a+b)²=a²+2ab+b²
(3+9)²=3²+2*3*9+9²=9+54+81=144
(a-b)²=a²-2ab+b²
(11-5)²=11²-2*11*5+5²=121-110+25=36
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(a+b)²=a²+2ab+b²
(3+9)²=3²+2*3*9+9²=9+54+81=144
(a-b)²=a²-2ab+b²
(11-5)²=11²-2*11*5+5²=121-110+25=36