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1. \(4x^2-17xy+13y^2=4x^2-4xy-13xy+13y^2=4x\left(x-y\right)-13y\left(x-y\right)=\left(x-y\right)\left(4x-13y\right)\)
2. \(2x\left(x-5\right)-x\left(3+2x\right)=26\Leftrightarrow2x^2-10x-3x-2x^2=26\Leftrightarrow-13x=26\Leftrightarrow x=-2\)
3. \(A=\left(2a-3b\right)^2+2\left(2a-3b\right)\left(3a-2b\right)+\left(2b-3a\right)^2\)
\(\Leftrightarrow\left(2a-3b\right)^2-2\left(2a-3b\right)\left(2b-3a\right)+\left(2b-3a\right)^2=\left(2a-3b-2b+3a\right)^2=\left(5a-5b\right)^2\)
\(=25\left(a-b\right)^2=25\cdot100=2500\)
A/\(4x^2-12+9\)
\(=\left(2x\right)^2-2.2.3+3^2\)
\(=\left(2x+3\right)^2\)
B/\(11x+11y-x^2-xy\)
\(=\left(11x-x^2\right)+\left(11y-xy\right)\)
\(=x\left(11-x\right)+y\left(11-x\right)\)
\(=\left(11-x\right)\left(x+y\right)\)
C/\(4a^2b^2-\left(a^2+b^2-c^2\right)^2\)
\(=\left(2ab\right)^2-\left(a^2+b^2-c^2\right)^2\)
\(=\left(2ab+a^2+b^2-c^2\right)\left(2ab-a^2-b^2+c^2\right)\)
a) x2 + 4x + 3 - y2 -2y
= x2 +4x + 4 - y2 -2y-1
= (x+2)2 - (y+1)2
= (x+2-y-1).(x+2+y+1)
= (x-y+1).(x+y+3)
b) 2a2 -5ab + 2b2
= 2a2 -4ab + 2b2 - ab
= 2.(a2 - 2ab+b2) - ab
= 2.(a-b)2 -ab
...
c) (x+y)2 - 2x - 2y + 1
= (x+y)2 - 1 - 2x -2y +2
= (x+y-1).(x+y+1) - 2.(x+y-1)
= (x+y-1)2
\(x^2-408x+2015=\left(x^2-5x\right)-\left(403x-2015\right)\)
\(=x\left(x-5\right)-403\left(x-5\right)=\left(x-5\right)\left(x-403\right)\)
a) x2 - 408x + 2015
= x2 - 403x - 5x + 2015
= ( x2 - 403x ) - ( 5x - 2015 )
= x( x - 403 ) - 5( x - 403 )
=( x - 403 )( x - 5 )
b) x2 - ( a2 + b2 )x + a2b2
= x2 - a2x - b2x + a2b2
= ( x2 - a2x ) - ( b2x - a2b2 )
= x( x - a2 ) - b2( x - a2 )
= ( x - a2 )( x - b2 )