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\(=2x^4-6x^3-x^3+3x^2-5x^2+15x-2x+6\)
\(=2x^3\left(x-3\right)-x^2\left(x-3\right)-5x\left(x-3\right)-2\left(x-3\right)\)
\(=\left(x-3\right)\left(2x^3-x^2-5x-2\right)\)
\(=\left(x-3\right)\left(2x^3-4x^2+3x^2-6x+x-2\right)\)
\(=\left(x-3\right)\left[2x^2\left(x-2\right)+3x\left(x-2\right)+\left(x-2\right)\right]\)
\(=\left(x-3\right)\left(x-2\right)\left(2x^2+3x+1\right)\)
\(=\left(x-3\right)\left(x-2\right)\left(x+1\right)\left(2x+1\right)\)
Thời gian có hạn copy cái này hộ mình vào google xem nha :
https://lazi.vn/quiz/d/16491/nhac-edm-la-loai-nhac-the-loai-gi
Vào xem xong các bạn nhận được 1 thẻ cào mệnh giá 100k nhận thưởng bằng cách nhắn tin vs mình và 1 phần thưởng bí mật là chiếc áo đá bóng,....
Có 300 giải nhanh nha đã có 241 người nhận rồi
OKthanks
\(x^4+5x^3-7x^2-41x-30\)
\(=x^4+x^3+4x^3+4x^2-11x^2-11x-30x-30\)
\(=x^3\left(x+1\right)+4x^2\left(x+1\right)-11x\left(x+1\right)-3x\left(x+1\right)\)
\(=\left(x+1\right)\left(x^3+4x^2-11x-30\right)\)
\(=\left(x+1\right)\left(x^3-3x^2+7x^2-21x+10x-30\right)\)
\(=\left(x+1\right)\left[x^2\left(x-3\right)+7x\left(x-3\right)+10x\left(x-3\right)\right]\)
\(=\left(x+1\right)\left(x-3\right)\left(x^2+2x+5x+10\right)\)
\(=\left(x+1\right)\left(x-3\right)\left(x+2\right)\left(x+5\right)\)
\(x^2-7x+9\)
\(=x^2-2\cdot x\cdot\frac{7}{2}+\left(\frac{7}{2}\right)^2-\frac{13}{4}\)
\(=\left(x-\frac{7}{2}\right)^2-\left(\frac{\sqrt{13}}{2}\right)^2\)
\(=\left(x-\frac{7}{2}-\frac{\sqrt{13}}{2}\right)\left(x-\frac{7}{2}+\frac{\sqrt{13}}{2}\right)\)
\(=\left(x-\frac{7+\sqrt{13}}{2}\right)\left(x-\frac{7-\sqrt{13}}{2}\right)\)
a) \(x^5+x+1\)
\(=\left(x^5+x^4+x^3\right)-\left(x^4+x^3+x^2\right)+\left(x^2+x+1\right)\)
\(=x^3\left(x^2+x+1\right)-x^2\left(x^2+x+1\right)+\left(x^2+x+1\right)\)
\(=\left(x^3-x^2+1\right)\left(x^2+x+1\right)\)
b) \(6x^2-13x+6\)
\(=\left(6x^2-9x\right)-\left(4x-6\right)\)
\(=3x\left(2x-3\right)-2\left(2x-3\right)\)
\(=\left(2x-3\right)\left(3x-2\right)\)
\(\text{a)}x^3-6x^2+12x-8\)
\(=x^3-2x^2-4x^2+8x+4x-8\)
\(=\left(x^3-2x^2\right)-\left(4x^2-8x\right)+\left(4x-8\right)\)
\(=x^2\left(x-2\right)+4x\left(x-2\right)+4\left(x-2\right)\)
\(=\left(x-2\right)\left(x^2+4x+4\right)\)
\(=\left(x-2\right)\left(x+2\right)^2\)
\(\text{b)}8x^2+12x^2y+6xy^2+y^3=\left(2x+y\right)^3\)
Bài 2:
\(\text{a) }x^7+1=\left(x^{\frac{7}{3}}\right)^3+1^3=\left(x^{\frac{7}{3}}+1\right)\left[\left(x^{\frac{7}{3}}\right)^2-x^{\frac{7}{3}}+1\right]=\left(x^{\frac{7}{3}}+1\right)\left(x^{\frac{14}{3}}-x^{\frac{7}{3}}+1\right)\)
\(\text{b) }x^{10}-1=\left(x^5\right)^2-1^2=\left(x^5-1\right)\left(x^5+1\right)\)
Bài 3:
\(\text{a) }69^2-31^2=\left(69-31\right)\left(69+31\right)=38.100=3800\)
\(\text{b) }1023^2-23^2=\left(1023-23\right)\left(1023+23\right)=1000.1046=1046000\)
Theo đề ta có:
\(\frac{x^4}{2}-2x^2\)
\(=\frac{x^4-4x^2}{2}\)
\(=\frac{x^2\left(x^2-4\right)}{2}\)
\(=\frac{x^2\left(x-2\right)\left(x+2\right)}{2}\)
a,x8 +x4 +1=x6 .x2 +x3 .x+1=x6 .x2-x2 +x3 .x-x+1+x+x2=x2.(x6-1)+x.(x3-1)+1+x+x2=x2.(x3-1).(x3+1)+x.(x-1).(x2+x+1)+1+x+x2
\(x^4+13x^2+36=x^4+4x^2+9x^2+36\)
\(=x^2\left(x^2+4\right)+9\left(x^2+4\right)=\left(x^2+9\right)\left(x^2+4\right)\)
\(x^4+13x^2+36\)
<=> \(x^4+9x^2+4x^2+36\)
<=> \(x^2\left(x^2+9\right)+4\left(x^2+9\right)\)
<=> \(\left(x^2+9\right)\left(x^2+4\right)\)