Question

(y+4)2 cтепени  срочно

Answer 1

(у+4)²=у²+8у+16
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Answer 2

$(a+b) ^{2} =a^{2} +b ^{2} +2ab\ \ \ (y+4)^{2}=y^{2} +4^{2} +2*4*y=y^{2} +16+8y$