a, x2-7=\(\left(x-\sqrt{7}\right)\left(x+\sqrt{7}\right)\)
b, x2-3=\(\left(x-\sqrt{3}\right)\left(x+\sqrt{3}\right)\)
Học tốt!!!!!!!!!!
a/ \(x^2-7\)
\(=\left(x-\sqrt{7}\right)\left(x+\sqrt{7}\right)\)
b/ \(x^2-3\)
\(=\left(x-\sqrt{3}\right)\left(x+\sqrt{3}\right)\)
c/ \(x^2-2\sqrt{13}x+13\)
\(=\left(x-\sqrt{13}\right)^2\)
Mấy bài này áp dụng HĐT nhé bạn :3