Đáp án:
Giải thích các bước giải:
a) -14x² +39x -10
=-14x² +35x +4x-10
=-7x.(2x-5) +2.(2x-5)
=(2x-5).(2x-7)
b)x³ +2x² -25x -50
=(x³ +2x²) -(25x +50)
=x².(x+2) -25.(x+2)
=(x+2) .(x² -25)
=(x+2).(x-5).(x+5)
c)4x³ -14x² +6x
=(4x³ -12x²) -(2x² -6x)
=4x².(x -3) -2x.(x-3)
=(x-3) .(4x² -2x)
=(x-3) .2x.(2x-1)
d)x³ +4x² -29x +24
=x³ -x² +5x² -5x -24x +24
=(x³-x²) +(5x² -5x) -(24x -24)
=x².(x-1) +5x.(x-1) -24.(x-1)
=(x-1) .(x² +5x -24)
e) x³ +21x² +134x +240
=x³ +3x² +18x² +54x +80x+240
=(x³ +3x²) +(18x²+54x) +(80x+240)
=x².(x+3) +18x(x+3) +80.(x+3)
=(x+3).(x² +18x +80)
