Question

Номер 511…………………………………………

Answer 1

$sqrt{b+49-14 sqrt{b} } + sqrt{b+49+14 sqrt{b} }= \ = sqrt{ (sqrt{b}) ^2-2cdot7 cdot sqrt{b}+7^2 } + sqrt{ (sqrt{b})^2 +2cdot7 cdot sqrt{b}+7^2 }= \ =sqrt{ (sqrt{b}-7) ^2 } + sqrt{ (sqrt{b}+7)^2 }= |sqrt{b}-7| + |sqrt{b}+7|= \ =7-sqrt{b} +sqrt{b}+7=14$