Question

Выполните действия
(4-3√а)(4+3√а)-4а

Answer 1

(4-3√а)(4+3√а)-4а

16-9a-4a

16-13a

Answer 2

$(4-3sqrt{a})(4+3 sqrt{a})-4a= 4^{2}-(3 sqrt{a}) ^{2} -4a=16-9a-4a=16-13a$