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10x2 + 17x - 6
\(=10x^2+20x-3x-6\)
\(=10x\left(x+2\right)-3\left(x+2\right)=\left(x+2\right)\left(10x-3\right)\)
- 10x2 - 17x +6
\(=-10x^2-20x+3x+6\)
\(=-10x\left(x+2\right)+3\left(x+2\right)=\left(x+2\right)\left(-10x+3\right)\)
- 10x2 + 28x + 6
\(=-10x^2+30x-2x+6\)
\(=-10x\left(x+3\right)-2\left(x+3\right)=-\left(x+3\right)\left(10x+2\right)\)
10x2 - 28x -6
\(=10x^2-30x+2x-6\)
\(=10x\left(x-3\right)+2\left(x-3\right)=\left(x-3\right)\left(10x+2\right)\)
- 6x2+13x+6
=6x2+9x+4x+6
=3x(2x+3)+2(2x+3)
=(2x+3)(3x+2)
2. 6x2-15x+6
=6x2-12x-3x+6
=6x(x-2)-3(x-2)
=(x-2).3(2x-1)
3. 8x2 -2x-3
= 8x2-6x+4x-3
=2x(4x-3)+(4x-3)
=(4x-3)(2x+1)
4. 8x2-10x-3
=8x2+12x-2x-3
=4x(2x+3)-(2x+3)
=(2x+3)(4x-1)
5. -10x2+4x+6
=-10x2+10x-6x+6
=-10x(x-1)-6(x-1)
=(x-1).(-2)(5x+3)
6. 10x2-28x-6
=10x2-30x+2x-6
=10x(x-3)+2(x-3)
=(x-3).2(5x+1)
6x2 + 13x + 6 = 6x2 + 9x + 4x + 6 = 3x( 2x + 3 ) + 2( 2x + 3 ) = ( 2x + 3 )( 3x + 2 )
6x2 - 15x + 6 = 6x2 - 12x - 3x + 6 = 6x( x - 2 ) - 3( x - 2 ) = 3( x - 2 )( 2x - 1 )
49x2+28x-5=49x2+28x+4-9=(7x+2)2-9=(7x+2-9)(7x+2+9)=(7x-7)(7x+11)=7(x-1)(7x+11)
a) \(-10x^2-17x+6\)
\(=-10x^2-20x+3x+6\)
\(=-10x\left(x+2\right)+3\left(x+2\right)\)
\(=\left(x+2\right)\left(3-10x\right)\)
b)\(x^2-10x+9\)
\(=x^2-x-9x+9\)
\(=x\left(x-1\right)-9\left(x-1\right)\)
\(=\left(x-1\right)\left(x-9\right)\)
c) \(x^2-10x+24\)
\(=x^2-4x-6x+24\)
\(=x\left(x-4\right)-6\left(x-4\right)\)
\(=\left(x-4\right)\left(x-6\right)\)
\(x^4+8x^3+28x^2+48x-13\)
\(=x^4+4x^3+13x^2+4x^3+16x^2+52x-x^2-4x-13\)
\(=x^2\left(x^2+4x+13\right)+4x\left(x^2+4x+13\right)-\left(x^2+4x+13\right)\)
\(=\left(x^2+4x-1\right)\left(x^2+4x+13\right)\)
Đặt x2+10x+5=a.Ta có biểu thức là : a(a+8)+16=a2+8a+16=(a+4)2=(x2+10x+9)2