Question

3(2x-1)(3x-1)-(2x-3)(9x-1)
thực hiện p.tính

Answer 1

=3(6x^2-5x+1)-(18x^2-2x-27x+3)

=18x^2-15x+3-18x^2+29x-3

=14x

Answer 2

\(3\left(2x-1\right)\left(3x-1\right)-\left(2x-3\right)\left(9x-1\right)\)

\(=3\cdot\left(6x^2-2x-3x+1\right)-\left(18x^2-2x-27x+3\right)\)

\(=3\cdot\left(6x^2-5x+1\right)-\left(18x^2-29x+3\right)\)

\(=18x^2-15x+3-18x^2+29x-3\)

\(=\left(18x^2-18x^2\right)+\left(-15x+29x\right)+\left(3-3\right)\)

\(=0+14x+0\)

\(=14x\)