Question

найдите значения выражения 10ab+(-5a+b)^2 при a=√2,b=√5

Answer 1

$10(sqrt{2})b+(-5sqrt{2} +b)^2$

$10(sqrt{2} )(sqrt{5} )+(-5sqrt{2} +sqrt{5} )^2$

$10(sqrt{2})(sqrt{5})+(-5sqrt{2}+sqrt{5} )^2$

$10sqrt{10} +(55-10sqrt{10} )$

$55$