Question

Đề bài:triển khai hàng đẳng thức

Answer 1

10) \(\left(3x\right)^2-9y^4\)

\(=\left(3x\right)^2-\left(3y^2\right)^2\)

\(=\left(3x-3y^2\right)\left(3x+3y^2\right)\)

11) \(16x^2-\left(y^2\right)^2=\left(4x\right)^2-\left(y^2\right)^2\)

 \(=\left(4x-y^2\right)\left(4x+y^2\right)\)

12) \(x^4-\left(3y^2\right)^2=\left(x^2\right)^2-\left(3y^2\right)^2\)

\(=\left(x^2-3y^2\right)\left(x^2+3y^2\right)\)

Answer 2

10)

\(\left(3x\right)^2-9y^4\\ =\left(3x\right)^2-\left(3y^2\right)^2\\ =\left(3x-3y^2\right)\left(3x+3y^2\right)\)

11)

\(16x^2-\left(y^2\right)^2\\ =\left(4x\right)^2-\left(y^2\right)^2\\ =\left(4x-y\right)\left(4x+y\right)\)

12)

\(x^4-\left(3y^2\right)^2\\ =\left(x^2\right)^2-\left(3y^2\right)^2\\ =\left(x^2-3y^2\right)\left(x^2+3y^2\right)\)