Question

Phân tích ra thừa số:

a, x - 9 với x > 0

b, x - 5\(\sqrt{x}\) + 4

d, x-2\(\sqrt{x-1}\) - a²

Answer 1

Bài đã chữa:

a, x - 9 (x > 0)

= \(\left(\sqrt{x}\right)^2\) - 3²

= \(\left(\sqrt{x}+3\right)\left(\sqrt{x}-3\right)\)

b, x - 5\(\sqrt{x}\) + 4

= x - \(4\sqrt{x}-\sqrt{x}\) +4

= \(\left(\sqrt{x}-1\right)\left(\sqrt{x}-4\right)\)

Answer 2

Câu d sai đề kìa bạn

Answer 3

d: \(=x-1-2\sqrt{x-1}+1-a^2\)

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

\(=\left(\sqrt{x-1}-1-a\right)\left(\sqrt{x-1}-1+a\right)\)

a: \(=\left(\sqrt{x}-3\right)\left(\sqrt{x}+3\right)\)

b: \(=\left(\sqrt{x}-1\right)\left(\sqrt{x}-4\right)\)