giúp mình với nếu đúng mk tick 5 sao
a., x^2 -x-2 b.,x^2-5x+6 c.,x^4-16 d., x^3-8
————- ————- ———– ——————
x^2+4x+3 x^2+x-12 x^3-4x x^3+3x^2+4x
giúp mình với nếu đúng mk tick 5 sao
a., x^2 -x-2 b.,x^2-5x+6 c.,x^4-16 d., x^3-8
————- ————- ———– ——————
x^2+4x+3 x^2+x-12 x^3-4x x^3+3x^2+4x
Đáp án:
Giải thích các bước giải:
a) x² -x -2 =x² +x-2x-2
=(x² +x) – (2x +2)
=x.(x+1) -2.(x +1)
=(x +1).(x -2)
b)x² -5x +6
=x² -2x -3x +6
=x.(x -2) -3.(x -2)
=(x -2).(x -3)
c)$x^{4}$ -16
=$x²^{2}$ -4²
=(x² -4).(x² +4)
=(x -2).(x +2).(x² +4)
d)x² +4x +3
=x² +x +3x +3
=x.(x+1) +3.(x+1)
=(x+1).( x+3)
e) x² +x -12
=x² +4x -3x -12
=x.(x+4) -3.(x +4)
=(x +4).( x-3)
f)x³ -4x
=x.(x ² -4)
=x.(x -2) .( x+2)
g)x³ +3x² +4x
=x.(x² +3x +4)
`a,x² -x -2`
`=(x² +x) – (2x +2)`
`=x(x+1) -2(x +1)`
`=(x +1).(x -2)`
`b,x² -5x +6`
`=x² -2x -3x +6`
`=x (x -2) -3 (x -2)`
`=(x -2)(x -3)`
`c,x^4 -16`
`=x^{2^2} -4²`
`=(x -2)(x +2)(x² +4)`
`d,x² +4x +3`
`=x² +x +3x +3`
`=x(x+1) +3(x+1)`
`=(x+1)( x+3)`
`e, x² +x -12`
`=x² +4x -3x -12`
`=(x +4).( x-3)`
`f,x³ -4x`
`=x(x -2)( x+2)`
`g,x³ +3x² +4x`
`=x(x² +3x +4)`
Xin hay nhất !