Question

Phân tích các đa thức sau thành nhân tử :

\(\dfrac{x^2}{9}-\dfrac{y^2}{16}\)

Answer 1

\(\dfrac{x^2}{9}-\dfrac{y^2}{16}\)

\(=\left(\dfrac{x}{3}\right)^2-\left(\dfrac{y}{4}\right)^2\)

\(=\left(\dfrac{x}{3}-\dfrac{y}{4}\right)\left(\dfrac{x}{3}+\dfrac{y}{4}\right)\)

Answer 2

\(=\left(\dfrac{1}{3}x-\dfrac{1}{4}y\right)\left(\dfrac{1}{3}x+\dfrac{1}{4}y\right)\)