По формуле (а+b)^2 = a^2 + 2ab + b^2
7 + 2√21 + 3 - 2√21 = 7 + 3 = 10
(√7+√3)^2-2√21=[7+2√7√3+3]-2√21=10+2√21-2√21=10
(a+b)²=a²+2ab+b²
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По формуле (а+b)^2 = a^2 + 2ab + b^2
7 + 2√21 + 3 - 2√21 = 7 + 3 = 10
(√7+√3)^2-2√21=[7+2√7√3+3]-2√21=10+2√21-2√21=10
(a+b)²=a²+2ab+b²