Đáp án:
17)4x(x+1)-2x(x-1)(x+1)+2x^3=0
⇔(x+1)(4x-2x(x-1))+2x^3=0
⇔(x+1)(4x-2x²+2x)+2x³=0
⇔(x+1)(6x-2x²)+2x³=0
⇔6x²-2x³+6x-2x+2x³=0
⇔6x²+4x=0
⇔2x(x+2)=0
2TH
18)(2x_3)(5x+1)-(3-2x)(4x+5)=0
⇔(2x_3)(5x+1)+(2x-3)(4x+5)=0
⇔(2x-3)(5x+1+4x+5)=0
⇔(2x-3)(9x+6)=0
⇔(2x-3)(3x+2)=0
19)(4x+2)(2x+3)-(2x+1)(3x-1)=0
⇔2(2x+1)(2x+3)-(2x+1)(3x-1)=0
⇔(2x+1)(2(2x+3)-(3x-1)=0
⇔(2x+1)(4x+6-3x+1)=0
⇔(2x+1)(x+7)=0
2TH
20) nhaan ra nha bn
21)(x+3)(x-2)-(x+3)²=0
⇔(x+3)(x-2-x-3)=0
⇔(x+3)(-5)=0
⇔x+3=0
⇔x=-3
22)(4x+1)(4x-1)-(4x+3)(1-4x)=0
⇔(4x-1)(4x+1-4x+3)=0
⇔(4x-1)4=0
Giải thích các bước giải:
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