1) 3х^2 + 8х - 3 = 3( Х - ( 1/3 ))( x + 3 ) = ( 3x - 1 )( x + 3 )
D = 64 + 36 = 100 = 10^2
X1 = ( - 8 + 10 ) : 6 = 1/3
X2 = ( - 8 - 10 ) : 6 = - 3
2) x^2 + 3x = x( x + 3 )
3) ( ( 3x - 1 )( x + 3 )) : ( x( x + 3 )) = ( 3x - 1 ) / x
(a-4)(a+3)=a^2-4a+3a-12=a^2-a-12
(m-11)(m-2)=m^2-11m-2m+22=m^2-13m+22
(y-4)(3y-4)=3y^2-12y-4y+16=3y^2-16y+16
(6a-5)(6a-1)=36a^2-30a-6a+5=36a^2-36a+5
(2b+3)(3b-2)=6b^2+9b-4b-6=6b^2+5b-6
(7z-2)(z-3)=7z^2-2z-21z+6=7z^2-23z+6