a²+2a(b+c)+(b+c)²
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a²+2a(b+c)+(b+c)²
a²+2a(b+c)+(b+c)²
a²+2a(b+c)+(b+c)²
a²+2a(b+c)+(b+c)²
=[a+(b+c)]²
=(a+b+c)²
a²+2a(b+c)+(b+c)²
a²+2a(b+c)+(b+c)²
a²+2a(b+c)+(b+c)²
a²+2a(b+c)+(b+c)²
=[a+(b+c)]²
=(a+b+c)²