a) x³ + 2x - 3

=x³+x²+3x-x²+x+3

=x(x²+x+3)-1(x²+x+3)

=(x-1)(x²+x+3)

b) x³ - x² + x + 3

=x³-2x²+3x+x²-2x+3

=x(x²-2x+3)+1(x²-2x+3)

=(x+1)(x²-2x+3)

c) 3x³ - 4x² + 13x - 4

=3x³-3x²+12-x²-x+4

=3x(x²-x+4)-1(x²-x+4)

=(3x-1)(x²-x+4)

d) 6x³ + x² + x + 1

=6x³-2x²+2x+3x²-x+1

=2x(3x²-x+1)+1(3x²-x+1)

=(2x+1)(3x²-x+1)

e)bạn phân tích tương tự nhé mk cho đáp án để bạn đổi chiếu nè

=(2x+1)(2x²+2x+1)

4. The bank manger said he wouldn’t lend me what I needed. (unwilling)

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