Question

Phân tích đa thức thành nhân tử

81-(3x+2)^2

Answer 1

\(81-\left(3x+2\right)^2=\left(9-3x-2\right)\left(9+3x+2\right)\)

\(=\left(7-3x\right)\left(11+3x\right)\)

Answer 2

\(81-\left(3x+2\right)^2=9^2-\left(3x+2\right)^2=\left(9-3x-2\right)\left(9+3x+1\right)=\left(7-3x\right)\left(10+3x\right)\)

Answer 3

9^2 -(3x+2)^2

=(9-3x-2)*(9+3x+2)

Answer 4

\(9^2-\left(3x+2\right)^2=\left(9-3x-2\right)\left(9+3x+2\right)=\left(7-3x\right)\left(11+3x\right)\)