Phân tích các đa thức sau thành nhân tử:\(a)\,\,x...

Câu hỏi: Phân tích các đa thức sau thành nhân tử:\(a)\,\,xy + 11x\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,b)\,\,{x^2} + 4{y^2} + 4xy - 16\)

A \(\begin{array}{l}a)\,\,xy + 11x\, = x.(y + 11)\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\\b)\,\,{x^2} + 4{y^2} + 4xy - 16 = (x - 2y + 4)(x + 2y - 4)\end{array}\)

B \(\begin{array}{l}a)\,\,xy + 11x\, = x.(y + 11)\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\\b)\,\,{x^2} + 4{y^2} + 4xy - 16 = (x + 2y + 4)(x - 2y - 4)\end{array}\)

C \(\begin{array}{l}a)\,\,xy + 11x\, = y.(x + 11)\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\\b)\,\,{x^2} + 4{y^2} + 4xy - 16 = (x + 2y + 4)(x + 2y - 4)\end{array}\)

D \(\begin{array}{l}a)\,\,xy + 11x\, = x.(y + 11)\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\\b)\,\,{x^2} + 4{y^2} + 4xy - 16 = (x + 2y + 4)(x + 2y - 4)\end{array}\)