Phân tích đa thức thành nhân tử
\(x^3-7x^2+10x\)
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x3-7x2+10x
=x3-2x2-5x2+10x
=(x3-2x2)-(5x2-10x)
=x2(x-2)-5x(x-2)
=(x2-5x)(x-2)
=x(x-5)(x-2)
giải phương trình:
\(\left(4x+3\right)^2=4\left(x-1\right)^2\)
a: Ta có: \(-3x^4+20x^3-35x^2-10x+48\)
\(=-\left(3x^4-20x^3+35x^2+10x-48\right)\)
\(=-\left(3x^4-9x^3-11x^3+33x^2+2x^2-6x+16x-48\right)\)
\(=-\left(x-3\right)\left(3x^3-11x^2+2x+16\right)\)
\(=-\left(x-3\right)\left(3x^3-6x^2-5x^2+10x-8x+16\right)\)
\(=-\left(x-3\right)\left(x-2\right)\left(3x^2-5x-8\right)\)
\(=-\left(x-3\right)\left(x-2\right)\left(3x-8\right)\left(x+1\right)\)
b: Ta có: \(-\left(2x^4+7x^3+x^2-7x-3\right)\)
\(=-\left(2x^4-2x^3+9x^3-9x^2+10x^2-10x+3x-3\right)\)
\(=-\left(x-1\right)\left(2x^3+9x^2+10x+3\right)\)
\(=-\left(x-1\right)\left(2x^3+2x^2+7x^2+7x+3x+3\right)\)
\(=-\left(x-1\right)\left(x+1\right)\left(2x^2+7x+3\right)\)
\(=-\left(x-1\right)\left(x+1\right)\cdot\left(x+3\right)\left(2x+1\right)\)
1) =\(-3x^4+9x^3+11x^3-33x^2-2x^2+6x-16x+48\)
=\(-3x^3\left(x-3\right)+11x^2\left(x-3\right)-2x\left(x-3\right)-16\left(x-3\right)\)
= \(\left(x-3\right)\left(-3x^3+11x^2-2x-16\right)\)
= \(\left(x-3\right)\left(-3x^3+6x^2+5x^2-10x+8x-16\right)\)
=\(\left(x-3\right)\left(-3x^2\left(x-2\right)+5x\left(x-2\right)+8\left(x-2\right)\right)\)
= \(\left(x-3\right)\left(x-2\right)\left(-3x^2+5x+8\right)\)
= \(\left(x-3\right)\left(x-2\right)\left(x-\frac{8}{3}\right)\left(x+1\right)\)
Ý b lm theo ý tưởng tương tự nha bn :D
a, x^2 + 5x +4
= x^2 + 1x + 4x + 4
= (x^2 + 1x) + (4x + 4)
= x ( x + 1 ) + 4 ( x + 1 )
= (x + 1) (x + 4)
b, x^2 - 6x + 5
= x^2 - 1x - 5x + 5
= (x^2 - 1x) - (5x - 5)
= x (x - 1) - 5 (x - 1)
= (x - 1) (x - 5)
c, x^2 + 7x + 12
= x^2 + 3x + 4x + 12
= (x^2 + 3x) + (4x + 12)
= x (x + 3) + 4 (x + 3)
= (x + 3) (x + 4)
d, 2x^2 - 5x + 3
= 2^x2 - 2x - 3x + 3
= 2x (x - 1) - 3 (x - 1)
= (x-1) (2x - 3)
e, 7x - 3x^2 - 4
= 3x + 4x - 3x^2 - 4
= (3x - 3x^2) + (4x - 4)
= 3x (1 - x) + 4 (x - 1)
= 3x (1-x) - 4 (1 - x)
= (1 - x) (3x - 4)
f, x^2 - 10x + 16
= x^2 - 2x - 8x + 16
= (x^2 - 2x) - (8x - 16)
= x (x - 2) - 8 (x - 2)
= (x - 2) (x - 8)
a, (x+1)(x+4)
b,(x-5)(x-1)
c,(x+3)(x+4)
d,(2x-3)(x-1)
e,(-3x+4)(x-1)
f, (x-8)(x-2)
3x2 + 10x +3
=> 3x2 + 9x +x +3
=> (3x2 +x )+ ( 9x +3)
=> x(3x +1) +3( 3x+1)
=>(3x+1) (x+3)
Tự làm tiếp nhé
a, ta có: 3x^2 +10x+3= 3x^2 + 9x +x +3 = 3x(x+3)+(x+3)=(x+3)+(3x+1)
2 câu còn lại đang trong qtrinhf suy nghĩ
a) x3-10x2+21x
= x3-7x2-3x2+21x
= x2(x-7)-3x(x-7)
= (x2-3x)(x-7)
b) 3x3-7x2-20x
= x(3x2-7x-20)
= x(3x2+5x-12x-20)
= x[x(3x+5)-4(3x+5)]
= x(x-4)(3x+5)
a)x3-10x-12
=x3-4x-6x-12
=x.(x2-4)-6.(x+2)
=x.(x-2)(x+2)-6.(x+2)
=(x+2)[x.(x-2)-6]
=(x+2)(x2-2x-6)
b)x3-7x-6
=x3-x-6x-6
=x.(x2-1)-6.(x+1)
=x.(x-1)(x+1)-6.(x+1)
=(x+1)[x.(x-1)-6]
=(x+1)(x2-x-6)
=(x+1)(x2+2x-3x-6)
=(x+1)[x.(x+2)-3.(x+2)]
=(x+1)(x+2)(x-3)
a) 7x3 - 5x2
= x2( 7x - 5 )
b) x2 - 10x + 25
= x2 - 2.5.x + 52
= ( x - 5 )2
x^3−7x^2+10x
x^3-5x^2-2x^2+10x
x^2(x-5)-2x(x-5)
(x^2-2x)(x-5)
x3 - 7x2 + 10x
=x3 - 2x2 - 5x2 + 10x
=(x3 -2x2) - (5x2 - 10x)
= x2( x - 2) - 5x( x - 2)
= (x - 2) (x2 - 5x)
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