Question

Phân tích: a) \(4x^2-49-12xy+9y^2\)

Answer 1

4x²-49-12xy+9y²

=[(2x)²-2.2x.3y+(3y)²] - 7²

=(2x-3y)² - 7²

=(2x-3y - 7) ( 2x-3y+7)

 

Answer 2

a) \(4x^2-49-12xy+9y^2\)

\(< =>-\left(4x^2+12xy+9y^2\right)-49\)

\(< =>-\left(2x+3y\right)^2-7^2\\ < =>\left(-2x-3y-7\right)\left(-2x-3y+7\right)\)