Question

\(4a-4\sqrt{a}-1\)

phân tích thành nhân tử

Answer 1

\(\left(2\sqrt{a}\right)^2-2.2\sqrt{a}+1-2=\left(2\sqrt{a}-1\right)^2-2=\left(2\sqrt{a}-1-\sqrt{2}\right)\left(2\sqrt{a}-1+\sqrt{2}\right)\)

Answer 2

`= (2 sqrt a)^2 - 2 . 2 sqrt a + 1 -2 = (2 sqrt a - 1)^2 - 2 = (2 sqrt a - 1 - sqrt 2)(2 sqrt a- 1 + sqrt 2).`