Question

Спростіть вираз: (√а-1)((√а+2)

Answer 1

$( sqrt{a} - 1) times ( sqrt{a} + 2) = \ sqrt{a} times sqrt{a} + sqrt{a} times 2 + - 1 times sqrt{a} + - 1 times 2 = \ a times 2 sqrt{a} - sqrt{a} - 2 = \ a - sqrt{a} - 2$