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\(=x^5-2x^4+x^3-x^4+2x^3-x^2\)
\(=x^3\left(x^2-2x+1\right)-x^2\left(x^2-2x+1\right)\)
\(=\left(x^2-2x+1\right)\left(x^3-x^2\right)\)
\(=\left(x-1\right)^2x^2\left(x-1\right)=\left(x-1\right)^3x^2\)
\(=x^2\left(x^3-1\right)-3x^3\left(x-1\right)\)
\(=x^2\left(x-1\right)\left(x^2+x+1-3x\right)\)
\(=x^2\left(x-1\right)\left(x^2-2x+1\right)\)
\(=x^2\left(x-1\right)\left(x-1\right)^2\)
\(=x^2\left(x-1\right)^3\)
x^3+3x^2-4
=x3-1+3x2-3
=(x-1)(x2+x+1)+3.(x2-1)
=(x-1)(x2+x+1)+3.(x-1)(x+1)
=(x-1)(x2+x+1+3x+3)
=(x-1)(x2+4x+4)
=(x-1)(x+2)2
bn này hỏi 2 bài toàn bài khó, bài này khó hơn nhưng hay hơn
= ((x2+4) -3x)((x2+4) +3x) - 12
= (x2+4)2 -9x2 -12= x4 +8x2 +16 -9x2 -12
= x4 -x2 +4 = .....làm típ nhé
\(x^4+3x^2-2x+3\)
\(=x^4+x^3-x^3+3x^2+x^2-x^2-3x+x+3\)
\(=\left(x^4-x^3+x^2\right)+\left(x^3-x^2+x\right)+\left(3x^2-3x+3\right)\)
\(=x^2\left(x^2-x+1\right)+x\left(x^2-x+1\right)+3\left(x^2-x+1\right)\)
\(=\left(x^2-x+1\right)\left(x^2+x+3\right)\)
bạn sử dụng phương pháp hệ số bất định nha để tìm đáp số
\(x^3+3x^2-4=x^3+2x^2+x^2-2^2\)
\(=x^2\left(x+2\right)+\left(x-2\right)\left(x+2\right)\)
\(=\left(x^2+x-2\right)\left(x+2\right)\)
\(=\left(x^2-x+2x-2\right)\left(x+2\right)\)
\(=\left[x\left(x-1\right)+2\left(x-1\right)\right]\left(x+2\right)\)
\(=\left(x-1\right)\left(x+2\right)\left(x+2\right)\)
\(=\left(x-1\right)\left(x+2\right)^2\)
x^4 - 4x^3 + 3x^2 +2X - 2 = 0
<=> (x^4 - x^3) - (3x^3 - 3x^2) + (2x - 2) = 0
<=> x^3(x -1)-3x^2(x-1) + 2(x-1) = 0
<=> (x-1)(x^3-3x^2+2) = 0
<=> (x-1)[(x^3-x^2) - (2x^2-2x) +(2-2x)] = 0
<=> (x-1)[x^2(x-1) - 2x(x-1) - 2(x-1)] = 0
<=> (x-1)(x-1)(x^2-2x-2) = 0
<=> (x-1)^2(x^2-2x-2) = 0 (*)
<=> (x-1)^2 = 0 (1) hoac (x^2-2x-2) = 0 (2)
giai (1): (x-1)^2 = 0 <=> x-1 = 0 <=> x=1
giai (2): x^2-2x-2=0 b'=b/2= -2/2=-1
denta'= b'^2 -ac = (-1)^2 - 1(-2) = 3 >0
vay pt (2) co 2 ngh phan biet:
x1= (-b'- can bac 2 cua denta)/ a = [-(-1) - can 3]/1=2-can 3
x2= (-b'+can bac 2 cua denta)/a = [-(-1)+can 3]/1=2+can 3
vay pt (*) co 3 ngh: x1= 1: x2= 2-can 3: x3=2+can 3